KEO

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The KEO satellite is a satellite space time capsule which will be launched in the end of year 2007 or 2008 carrying messages from the citizens of present Earth to humanity 50,000 years from now, when the satellite orbiting Earth will return. This project is supported by UNESCO (who voted it Project of the 21st Century), Hutchison Whampoa and the European Space Agency, among other institutions. Its name represents the 3 most frequently used sounds in common to the most widely spoken languages today, [k], [e] and [o]. [1]

Contents 1 The messages 2 Other contents 3 Technical aspects 4 Project history 5 Similar Projects 6 References 7 See also 8 External links

[edit] The messages

Every person is invited to write a message addressed to the future inhabitants — the deadline is December 31, 2006. Messages can be keyed-in on the web, or sent by postal mail. The organisers encourage everybody to gather messages from children, senior citizens and the illiterate so that every culture and demographic on Earth is represented. The satellite has enough capacity to carry a four-page message from each of the more than six billion inhabitants on the planet. Once the satellite is launched, the messages with personal names removed will be made freely available on the web.

[edit] Other contents

KEO will also carry a diamond that encases a drop of human blood and samples of air, sea water and earth. The DNA of the human genome will be engraved on one of the faces. The satellite will also carry an astronomical clock that shows current rotation rates of several pulsars; photographs of people of all cultures; and "the contemporary Library of Alexandria", an encyclopaedic compendium of current human knowledge.

[edit] Technical aspects

The messages and library will be encoded in glass-made radiation-resistant DVDs. Symbolic instructions in several formats will show the future finders how to build a DVD reader, which may no longer exist 50,000 years from now.

The satellite itself is a hollow sphere 80 cm in diameter. It has two large wings, which "flap" along with sunlight and shadows.[2] The wings are purely symbolic. The sphere is engraved with a map of Earth and surrounded by an aluminium layer, a thermal layer and several layers of titanium and other heavy materials intertwined with vacuum. The sphere is resistant to cosmic radiation, atmosphere re-entry, space junk impacts and so on. As the satellite enters the atmosphere, the thermal layer will produce an artificial aurora to give a signal of the satellite's re-entry. The passive satellite will not carry any communications or propulsion systems. It will be launched by an Ariane 5 rocket into an orbit 1,800 km high, an altitude that will bring it back to Earth in 500 centuries, the same amount of time that has elapsed since early humans started to draw in cavern walls.

[edit] Project history

The KEO project was conceived in 1994 by French artist-scientist Jean-Marc Philippe, a pioneer of space art. Messages began to be collected, with an initial launch date set for 2001. Technical feasibility demonstration and other various delays have moved the launch date to 2007/2008, contingent upon the successful completion of the Ariane 5 rocket.

[edit] Similar Projects

Several previous spacecraft have included time capsules for humans (or aliens) in the far future. The LAGEOS satellite (which will re-enter the atmosphere in 8.4 million years) contains a plaque showing the arrangement of the Earth's continents in the past, present, and future. Pioneer 10 and Pioneer 11 both contain plaques that give pictorial information about their time and place of origin. Most famously, the two Voyager spacecraft each contain a golden record that contains pictures and sounds of Earth, along with symbolic directions for playing the record and data detailing the location of Earth.

[edit] References

[edit] See also

• Crypt of Civilization
• Bracewell probe

[edit] External links

• KEO website
• Digital Skyline - A Message to the Future