02 FÉVR. 2005
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1738
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1807: On 28 March 1807, Vesta 4, the only asteroid visible to the naked eye, thus the brightest on record, was first observed by the German astronomer Heinrich Wilhelm Olbers.
Vesta is a main belt asteroid with a diameter of 525 kilometres and a rotation period of 5.34 hours. Pictures taken by the Hubble Space Telescope in 1995 show Vesta's complex surface, with a geology similar to that of terrestrial worlds - such as Earth or Mars - a surprisingly diverse world with an exposed mantle, ancient lava flows and impact basins.
It once had a molten interior. This contradicts conventional ideas that asteroids essentially are cold, rocky fragments left behind from the early days of planetary formation.
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25 March
1655: On 25 March 1655, Christiaan Huygens discovered Titan, a moon of Saturn.
24 March
2003: On 24 March 2003, scientists working on ESA's Integral mission discussed their gamma-ray burst findings so far in a press conference at the American Astronomical Society at Mount Tremblant, Quebec, Canada.
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