Mo(NU)mentum

November 6th, 2008

Maarten Vanden Eynde
Mon(NU)mentum, 2008 AD
(450 x 60 cm)

Maarten Vanden Eynde Monumentum

Maarten Vanden Eynde Monumentum

Time is a philosophical dimension, a basic substance which we breath in and out constantly. Just like space it is always there. Time experience however seems to be working on many different levels in an ever changing and more personalized speed (sometimes a minute can last forever and your life can fly by in a fraction). Time is not static, it is always on the move. The impossibility to stop time is mirrored by the impossibility to live in the present. ‘Now’ is an elusive point between the past and the future. Like the gardener on his way to Ispahaan, the present is on his way to an unavoidable destiny: the past. There is no escape. When you read THIS word, it became history already. The future is catching up instantly. What is the force that powers the engine of time? Is the present being pulled towards the future?

The Universal Law of Gravitation has several important features. First, it is an inverse square law, meaning that the strength of the force between two massive objects decreases in proportion to the square of the distance between them as they move farther apart. Second, the direction in which the force acts is always along the line (or vector) connecting the two gravitating objects.
In 1687 Sir Isaac Newton first published his Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) which was a radical treatment of mechanics, establishing the concepts which were to dominate physics for the next two hundred years. Among the book’s most important new concepts was Newton’s Universal Law of Gravitation. Newton managed to take Kepler’s Laws governing the motion of the planets and Galileo’s ideas about kinematics and projectile motion and synthesize them into a law which governed both motion on earth and motion in the heavens. This was an achievement of enormous importance for physics; Newton’s discoveries meant that the universe was a rational place in which the same principles of nature applied to all objects.
Could it also work for Time?

Between two objects, let’s say A and B, there is a point where the gravitation of both objects is working with equal force (L1 point, named after Lagrange ). This point is balancing between the two attracting masses. If it is slightly bending towards A or B is will be attracted more by either one of them. It can only move from it’s frozen position, without loosing it’s equal balance, if A and B change mass simultaneously. The mass A is loosing, B has to gain. If time would be a linear experience, and A would be the past and B the future, than the point (C) hanging in the middle would be the present.
Presuming the past is getting longer and longer (or bigger and bigger), in order for C to be equally drawn to both A and B, it needs to be moving towards the future. The past is getting bigger and the future is getting smaller. And on top of that the speed of this process seems to be accelerating. With the population growth as exemplary model and driving fuel, evolution takes place at an unprecedented speed. New inventions and discoveries changing the world beyond recognition are constantly coming closer after each other. Just like the birth of matter during the big bang, time was created at the same moment and moves equally with the expanding universe; faster and faster to it’s final destiny.

The installation ‘Mo(NU)mentum’ is made up of several layers of history, creating a massive pillar. The drill core is like a sample of time, taken from the earth in the future to understand how the world evolved. Starting with a massive block of stone (in which the different geological layers are visible) the drill core contains samples of wood, copper, metal, bricks, concrete, asphalt, tar and plastic. The layers are getting thinner and thinner the closer they get to the present = the plastic layer. So far the materials created a foundation for the next, but the plastic layer is so thin and vulnerable that it is impossible to continue from there. It is a final moment in present evolution.

Maarten Vanden Eynde Monumentum

Mo(NU)mentum is a monument for the future, visualizing the impossibility to continue the current evolution. It is a permanent memory and trace of Generali Groups Executive Forum on Time: Business Opportunity and Strategic Timing. The best Champagne was served in plastic Champagne glasses. The empty glasses were collected and melted on top of the installation, thereby physically contributing the last layer.

Europe2014

May 4th, 2007

Maarten Vanden Eynde

Maarten Vanden Eynde new European Flag 2014

Join the forum on Europe Day, the 9th of May on www.europeday.info

Europe2012

May 4th, 2007

Maarten Vanden Eynde

Maarten Vanden Eynde new European Flag 2012

The present project Europe2008: In Varietate Concordia aims to stimulate international discussion about the future policy of the EU and ultimately to press for a fundamental change of course. Gradually even the stars on the flag should vanish, leaving us eventually with a universal clear blue flag, the flag of Planet Earth. Is a conceptual ideology desirable and more importantly: is it a realistic possibility?

Join the forum on Europe Day, the 9th of May on www.europeday.info

Europe2010

May 3rd, 2007

Maarten Vanden Eynde

Maarten Vanden Eynde new European Flag 2010

Since January 1st, 2007, the Union consists of 27 member states! Is further expansion desirable when the old 25 member states cannot successfully bring about an unequivocal policy? Does Europe need borders and if so, where do you draw the line? Croatia? Bosnia Herzegovina? Albania? Or Turkey? Georgia? Azerbeidzjan? And what about Russia? Or Canada? Israel?

Join the forum on Europe Day, the 9th of May on www.europeday.info

Europe2008

May 2nd, 2007

Maarten Vanden Eynde

Maarten Vanden Eynde new European Flag 2008

We have drifted too far away from the Utopian ideas that were essential to the foundation of Europe. Equality concerning basic resources and means should create freedom and stability that will make war in the future unnecessary. ‘To unify Europe is to make peace’, said the spiritual father of the European idea, Jean Monnet, in 1950.This is an ideology similar to that of the League of Nations and the United Nations and which should apply to the entire world population. And it is precisely this deviation, this betrayal of the ideology, which causes the present suspicion and ultimate rejection of the European Union. Is Europe a new country with new borders, or is it a concept for freedom and equality?

Join the forum on Europe Day, the 9th of May on www.europeday.info

Europe2006

May 1st, 2007

Maarten Vanden Eynde

Maarten Vanden Eynde new European Flag 2006

In 2006 there were still only 15 countries represented on the flag. The ten new member states of the European Union, which joined in 2004, have not been treated equally due to fear of a tidal wave of economic refugees. A special backdoor provision was created to allow each member state to implement its own restrictions (until 2011) against one or more countries at will. This inequality and discrimination is at odds with the founding spirit of the European Union. Should free movement of people, goods, services and capital be implemented universally and immediately upon accession to membership of the EU or is an adjustment period a better strategy?

Join the forum on Europe Day, the 9th of May on www.europeday.info

The History of Tomorrow

March 9th, 2007

- a short story-

by Maarten Vanden Eynde, 2006/2007
in collaboration with Marjolijn Dijkman

Maarten Vanden Eynde The History of Tomorrow

A billion stars twinkled in the universe, irregularly like diamonds. I woke up in a sweat and tried to christalize where I was. The heavy window screens were open but I could only feel a pitch-black sky. I rolled over to the side and found my glasses. There, up there on the left, it should be there! Was I still sleeping? I blinked my eyes a couple of times, but was disappointed again. It was gone, it was really gone…

The loss of gravitation first came to general notice on the 15th of June 2008, during the Olympics in Beijing, China. On that day 27 world records were broken. Read the rest of this entry »

EUTOPIA

June 17th, 2006

Europe is facing it’s most difficult challenge: how to create a united Europe? After the referenda on the new European Constitutional Law and the following disappointment about the French and Dutch NO, Europe is further away from unification than ever. But as a result inertia about Europa was replaced by genuine interest. What does it mean to be European? What do we represent? How much personal identity do we want to hand over to become a unity? The project is about the European Union as a whole and wants to raise questions about Europe in the past, the present and the future. Is Europe a new country with new borders or a concept for freedom and equality?

Maarten Vanden Eynde

Europe2006, 2006
Spun-poly silkscreen (155 gr/m2 polyester cloth), 100 x 150 cm

europe

On the 9th of May, the official Europe Day, the new flag was presented throughout the whole European Union.

Participating Cultural institutions include:

The Vienna Künstlerhaus and State of Sabotage in Austria, The Latvian National Museum of Art and Gallery Noass in Latvia, Lokaal 01 in Belgium, Pantheon Gallery in Cyprus, The DESTE Foundation for Contemporary Art and Booze Cooperativa in Greece, Stanica Cultural Centre in Slovakia, SCCA/Center for Contemporary Arts-Ljubljana in Slovenia, Galleria Rubin, Viafarini, PAN/Pallazo della Arti Napoli and ILOYOLI Lab in Italy, Casino Luxembourg - Forum d’art contemporain, Galerie Frank Gerlitzki espace ApART and ON25 societé civile in Luxembourg, Galeria Bielska BWA and Wyspa Institute of Art in Poland, CCB/Centro Cultural de Belem in Portugal, Kulturcenter HUSET and Charlottenborg Exhibition Hall in Denmark, Sally Stuudio and Tartu Kunstmuuseum in Estland, The Korjaamo culture factory in Finland, FAUX MOUVEMENT - centre d’art contemporain in France, Kunstverein KISS, Temporäres Museum, Untergröningen in Germany, The Contemporary Art Centre (CAC) and Vartai Gallery in Lithuania, St James Cavalier, Centre for Creativity in Malta, Artpool in Hongary, Four, The Irish Museum of Modern Art and Pallas Studios in Ireland, Tranzit Social Platform in Czech Republic, The Tapper-Popermajer Art Gallery in Sweden, La Mekanica in Spain, Hidde van Seggelen Contemporay Art and Ben Janssens Oriental Art in London UK, Smart Project Space, Kunstruimte Wagemans, Expodium, Lokaal 01, Sign, Peninsula, STROOM Den Haag and CBK Rotterdam in The Netherlands….

‘I left the ten last newcomers out, not because I don’t think they aren’t part of the EU, but because they are still not accepted as full members by the old EU countries. People coming from one of these countries don’t have the same freedom of movement through Europe as the rest of the Europeans. Although this is one of the basic rights as a European citizen. Europe is a concept for freedom, not a new country with new borders.

I think Europe should present itself as a variety of countries not as a unity. It is not a homogeneous circle of stars and it will never be one, so I put every star back on it’s original position, as the capital of the different countries. Like this an ‘abstract’ sky full of stars appears. The borders are opening…’

Maarten Vanden Eynde

Time Travel - Shaping the Future

February 28th, 2006

by Neil Johnson

The idea of travelling forward into the future or back into the past has always fascinated science fiction writers. The ‘grandfather paradox’ is the argument many people use to suggest that time travel is impossible. What if you went back in time and prevented your grandfather from meeting your grandmother so that your mother was never born? Then you would never have been born… and so on. Until very recently such arguments led most scientists to believe that time travel could never exist outside science fiction. But amazingly, some interpretations of the weirdness of the quantum world now suggest that time travel is possible - at least in theory.

Gravity and black holes
Einstein’s theory of relativity brought space and time together in a single, four-dimensional arrangement that he called spacetime. We know that we can travel forwards, backwards and sideways in space, so why not forwards and backwards in time?

Four dimensions are difficult to imagine, so physicists usually suggest you think of spacetime as a rubber sheet stretched out flat. If there are no large masses around, the sheet stays flat, and so any object placed on it will move around in straight lines. But a large mass, such as the Sun, makes a dip in the sheet because it actually warps spacetime. Now any other object with smaller mass, like our Earth, moving about in spacetime rolls into the dip as it comes past the Sun. It appears ‘attracted’ to the large mass. This effect of warping spacetime is what gives rise to gravity.
The Universe is full of heavy objects exerting gravitational effects and the net result is that spacetime is not flat at all but curved. Everything, including light, has to follow curved paths in spacetime. We know Einstein was right about this because astronomers can sometimes see distant stars that ought to be masked by nearer objects such as the Sun. Instead of travelling in straight lines and hence being blocked, the light from the stars bends round the obstruction.

When a star reaches the end of its life it may collapse inwards under the influence of its own gravity to such an extent that all its matter becomes concentrated into an extremely dense object a fraction of its original size. This is a black hole. Black holes have such a huge gravitational pull that nothing can escape from them, not even light. We cannot see them but we have good evidence that they exist. We can see stars behaving in ways which suggest that they are being pulled about by a nearby invisible object with enormous mass.
What does a black hole do to spacetime? Relativity predicts that at the centre of a black hole is an infinitely dense point, called a singularity, within which all the normal laws of physics no longer apply. Time, space, matter and energy no longer have any well-defined meaning. Einstein’s equations show that such a singularity doesn’t just make a dip in the imaginary rubber sheet of spacetime, it makes a tunnel that goes right through and momentarily opens out on the other side.
Where is ‘the other side’? It could be somewhere else in spacetime, either in the future or in the past, or it could even be in another Universe! If you could take a spaceship through such a tunnel, or wormhole, you would have discovered the secret of time travel. This is of course impossible with today’s technology. But in the future, who knows?

Mini wormholes
Einstein’s equations describe a spacetime that is perfectly smooth, like the rubber sheet. His theory of relativity only deals with the physics of what happens on big scales. It cannot deal with what happens at the centre of a black hole, or what happened during the moment of the Big Bang at the birth of the Universe when spacetime itself was infinitesimally small. That takes us back into the world of quantum physics.
If you could look at spacetime with a magnifying glass so powerful that it reached down to the quantum scale, you would not see the smooth, continuous sheet of Einstein’s spacetime. Just as a foam rubber ball looks smooth from a distance but rough and ragged close up. In this picture of spacetime it is quite likely that tiny holes could open up, entrances to little tunnels between now and other times, or between here and other universes. Another option for future time travellers would be somehow to harness these tiny wormholes and expand them.

Many worlds, many futures?
To return to the question that has puzzled thinkers since Newton’s day, is the future preordained? Or are there an infinite number of futures? One way of looking at the quantum world suggests that not only are there an infinite number of futures, but they are realised in an infinite number of universes.
Photons and electrons sometimes behave as waves and sometimes as particles, but never both at the same time. So far, the argument for interference between one universe and another applies only to events occurring at the quantum level.
But the idea of parallel universes provides a possible resolution to the ‘grandfather paradox’ that might otherwise cause problems for time travellers. If we travel back in time and change history, we launch ourselves into a new future in a parallel universe - but we have no effect on the present one from which we started out.

Scientists of the future may well pursue a new form of futuristic technology based on quantum effects. Such applications could include quantum teleportation, by which a quantum particle can be teleported from one point in space to another; and quantum computation, where calculations can be carried out which would take many years on a conventional computer. Although we now know how to measure time very accurately, have we come any nearer to answering the basic question ‘What is time?’.

Neil Johnson is a Physics lecturer at Oxford University where he heads his own research group.

Extraterrestrial Art

February 27th, 2006

On the 2nd of June 2003 an artpiece was send to another planet for the first time in human history. The painting, by Damien Hirst, consists of 16 multi-coloured spots on a 5cm by 5cm aluminium plate which was bolted to the lander, which was send to Mars . It had to cope with the cold of Mars, where temperatures drop to minus 70C, and pre-launch sterilisation which heats the painting to 155C.
Every part was designed to be useful. The aluminium plate was used to calibrate Beagle 2’s X-ray, the colours will check the camera, and minerals in the pigments would correct the sensor measuring the soil’s iron content. Beagle 2, named after the famous exploration-ship of Darwin, was launched on board the European Space Agency Mars Express craft from Kazakhstan.
Before Mars Express enters the orbit of Mars, Beagle 2 will be jettisoned and bounce to the planet’s surface, cushioned by inflatable bags. It will analyse sub-surface soil and rocks and take samples of the atmosphere to find out if life ever existed there.
Prof Pillinger, who commisioned Hirst said: “This collaboration is not about displaying art in space but about finding out if there is life on Mars.”
Just a few inches across and resembling a child’s watercolour paint box, the trademark Hirst spot painting was bolted to the British Beagle 2 space probe after a preview at London’s White Cube gallery.

beagle2

The pop group Blur also has a Beagle 2 connection. They wrote the call sign which the probe would send to mission control when it landed on Mars. (listen to the song on BBC website)

Beagle 2 was last seen heading for the red planet after separating from its European Space Agency mothership Mars Express on December 19 2003. Part of a mission estimated to cost $85 million, the probe was supposed to land on Mars a few days later on Christmas Day and search for signs of life, but vanished without trace…

SETI, the Search for Extraterrestrial Intelligence, is an exploratory science that seeks evidence of life in the universe by looking for some signature of its technology. (http://www.seti.org)

Gravitation of Time

February 10th, 2006

The Universal Law of Gravitation has several important features. First, it is an inverse square law, meaning that the strength of the force between two massive objects decreases in proportion to the square of the distance between them as they move farther apart. Second, the direction in which the force acts is always along the line (or vector) connecting the two gravitating objects.
In 1687 Sir Isaac Newton first published his Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) which was a radical treatment of mechanics, establishing the concepts which were to dominate physics for the next two hundred years. Among the book’s most important new concepts was Newton’s Universal Law of Gravitation. Newton managed to take Kepler’s Laws governing the motion of the planets and Galileo’s ideas about kinematics and projectile motion and synthesize them into a law which governed both motion on earth and motion in the heavens. This was an achievement of enormous importance for physics; Newton’s discoveries meant that the universe was a rational place in which the same principles of nature applied to all objects.

Maarten Vanden Eynde

‘Between two objects, let’s say A and B, there is a point where the gravitation of both objects is working with equal force (L1 point, named after Lagrange). This point is balancing between the two attracting masses. If it is slightly bending towards A or B is will be attracted more by either one of them. It can only move from it’s frozen position, without loosing it’s equal balance, if A and B change mass simultaneously. The mass A is loosing, B has to gain.

Time is always moving. When you read this word, it became history already. The future is catching up instantly. The present is an untouchable point always on the move.
If time would be a linear experience, and A would be the past and B the future, than the point hanging in the middle would be the present. The past is getting longer and longer (or bigger and bigger) so in order for this point to be equally drawn to both A and B, it needs to be moving towards the future. The past is getting bigger and the future is getting smaller. And on top of that the speed of this process is accelerating. Just like the birth of matter during the big bang, time was created at the same time and moves equally with the expanding universe; faster and faster to it’s final destiny. Will this be the end or a new beginning?’

time

The Lagrangian points (also Lagrange point, L-point, or libration point), are the five positions in interplanetary space where a small object affected only by gravity can theoretically be stationary relative to two larger objects (such as a satellite with respect to the Earth and Moon). They are analogous to geosynchronous orbits in that they allow an object to be in a “fixed” position in space rather than an orbit in which its relative position changes continuously.

Lagrangian points

Read the rest of this entry »

The Search for Extraterrestrial Life

February 3rd, 2006

The National Aeronautics and Space Administration

In 1958, the United States Congress created the National Aeronautics and Space Administration, or NASA. Its purpose was to coordinate and conduct all aeronautical and space activites for the United States of America, except those of the military. Among the many programs which NASA now runs, one is the search for life outside our home planet. NASA is currently examining our neighbor planet Mars for signs of life, as well as the moons of other planets in our solar system. It has also developed highly advanced technology for the search of life outside of our own solar system, such as special radars and infrared telescopes.

Mars

For decades, debates have been common and fierce as to whether life existed on our closest eighboring planet, Mars. Many believed that other beings, Martians, did indeed exist, and were highly intelligent. Others claimed that there was no proof of this, and that life as we know it was, in fact, not possible due to the extreme conditions of the Martian environment. In 1976, NASA sent two landers, Viking I and Viking II, to the surface of Mars to determine if life did indeed exist. However, when these landers executed their experiments, they showed rather convincingly that there were no organic compounds above the one part per billion level in the upper few centimeters of the surface. The landers also reported on the extreme environment of Mars, with temperatures falling to 120o Fahrenheit (48.9oC) below 0 at night. So, for a while the debate subsided surrounding the existence of life on Mars.

ALH84001

In 1996, a meteor was found in Allan Hills, Antarctica. Upon examination, it was discovered that this meteor, which is 4.5 billion years old, fell to the earth 13,000 years ago, and possibly contained evidence of life on Mars. Inside the meteor, along tiny cracks, scientists found evidence of what many believe to be ancient bacteria.

mars

There are four main clues which bring some scientists to this conclusion. One is that the meteorite is definitely of Martian origin and that it contains carbonate globules. The second is the presence of polycyclic aromatic compounds, which are complex organic molecules. The third piece of evidence is the presence of iron and other compounds which appear to be like those made by bacteria. The last, and perhaps most intriguing , is the pictures of the possible fossilized bacteria themselves. When taken separately, these pieces of evidence probably wouldnt amount to much. But what is compelling is that all of these pieces of evidence occurr within millimeters of each other.

However, skeptics still remain. Some simply arent sure, while others are certain that this meteorite contains no evidence of former life.. However, all agree that convincing evidence would contain proof that the fossils had cell walls, that the cells had been divided, and that chemicals more closely related to living organisms as we know them be found. And so, the debates continue. While these debates over ALH84001 occur, the science community continues its pursuit in finding signs of life, extant or extinct, on Mars.

Pathfinder, Sojourner

On July 4, 1997, a small spacecraft dropped onto Mars and tumbled to a stop. This pod, sent by the Jet Propulsion Laboratory in Pasadena, California, will be examining and doing tests on the Mars surface. This pod, called Pathfinder, will be sending signals back to Earth concerning the atmosphere and soil. It has also deployed a small land rover, similar to radio controlled cars.

mars2

This rover, called Sojourner, has been testing the Martian rocks for their minerals. In 2002, testing will be done on a different Mars probe to see if organic compounds or amino acids are present.If it finds amino acids buried in the surface, it will be testing to determine the chirality of the molecules. If they are homochiral, then that would be strong evidence that life existed at one point on Mars. If the amino acids are racemized, then it will be difficult to determine if they originated from life. In the next several years, NASA will be sending more space craft to Mars, to continue in its quest for extraterrestrial life.

Search for Extraterrestrial Intelligence

If you saw the movie Contact, written by Carl Sagan, you saw a lot of people with headphones listening to static coming from outer space. Then suddenly, one person is lucky enough to receive a signal from intelligent beings elsewhere in the universe. This may seem farfetched, but real people have actually been doing this for a living.

In 1959, a magazine article by Coccini and Morrison ignited widespread interest in the idea of searching for signals sent by intelligent beings in the universe. It was not until 1971, however, that the first international Search for Extraterrestrial Intelligence, or SETI, meeting occurred. One year later, Oliver and Billingham, in a paper called the Cyclops Report, layed out five main points as to why an organization should be formed to officially handle the SETI issue. The conclusion that Oliver and Billingham came to in the Cyclops report was that a SETI institute should be created as an ongoing part of the total NASA space program, with its own funding and budget. In 1976, the first institutionalized SETI program within NASA was created as the SETI Program Office at Ames Research Center. In 1977, JPL created a SETI office.

Originally, the goal of SETI was to detect signals from outer space. To accomplish this, giant radar dishes were designed and built. In Arecibo, high in the mountains of Puerto Rico, a 305-meter radio telescopeis used to detect signals and survey the sky.

radar

Its goal is to search for 800-1000 solar-type stars which are within 100 light years of the Ames Targeted Search Element. The goal of JPLs Sky Survey Element is to observe the entire sky with smaller, 34-meter telescopes. When the project is completed, it will have cost more than $108 million.

(Possible Mini Chem Window detailing the Cyclops report which sparked interest in SETI) The first item in their paper was that planetary systems were common, and that our solar system was in no way unique. Their second point was that many of these planetary systems contain at least one planet which is in the habitable zone. Oliver and Billingham also pointed out that, as shown by experiments by Miller and others, the organic compounds needed for the beginning of life may be formed in large quantities. The fourth point of the Cyclops Report was that stars typically have a life span long enough to support the evolution of life. Their last point was that if biological evolution did occur, then intelligent life would evolve.

Link to Mars:
http://nssdc.gsfc.nasa.gov/photo_gallery/photogallery-mars.html

The Earth seen from the Moon

November 23rd, 2005

Maarten Vanden Eynde

The Earth seen from the Moon (2005) is a work made for an equally named exhibition curated by Marco Altavilla in the Cesare Manzo Gallery in Pescara, Italy. It’s a bruised UN blue helmet with all the placenames that are given to the moon copied on the exact same location as on the 3D map of the moon. The bumps correspond with the seas and the craters. In the exhibition, the helmet was inside a closed space, and spinning around when pushed on a button. You had to look at the helmet through a telescope.

The Earth seen from the Moon, 2005 (25cm x 20cm x 20cm)

un-helmet

moonmap

Some facts about the Moon.

The Moon is the Earth only natural satellite. It is a barren, heavily cratered world, lacking water or an atmosphere. Tidel forces have ensured that the same side of the Moon now always faces the Earth. As the Moon travels round the Earth in the course of a month, it undergoes the familiar cycle of phases. The Moon shines only by reflected sunlight; the proportion of the sunlit side visible from Earth depends on the relative alignment of the Sun, Earth and Moon, which changes continuously over the Moon’s orbital period.
The terrain on the nearside falls into two basic types: the heavily cratered, light-coloured highlands, and the darker, more sparsely cratered maria (seas).

The maria have roughly circular outlines, a relic of their formation in the early history of the Moon by the impact of large meteorites.
The way the Moon formed is uncertain, but it has existed as a separate body for around 4,500 million years. Early in its life it became hot and molten. As it cooled, the crust formed but it was heavily cratered by impact of large numbers of meteorites, the largest of which created the mare basins. These subsequently filled with dark basaltic lavas. Significant volcanic activity then ceased, at least 2,000 million years ago.
The mean distance from Earth to the Moon is 384,400 km. The Moon’s radius is 1,738 km; mean density is 3.34 g/cm3.