Sizes for potentially dangerous asteroids

Near Earth Objects (NEOs) are asteroids or comets whose orbits sometimes take them close to the earth's orbit. An NEO could therefore someday collide with the earth -- and there are almost 7000 of them known, with several times that many predicted to exist.

Near-Earth Objects (NEOs) are asteroids whose orbits bring them close to Earth. This image of the asteroid Gaspra was obtained by the Galileo spacecraft; although not an NEO, Gaspra's surface may resemble that of some NEOs. NEOs are also potential astronaut destinations. SAO astronomers announced the first results of the largest program now underway to determine the sizes and characteristics of NEOs. Credit: NASA

 

Sources : http://www.physorg.com/news202138305.html

L'affaire Bogdanoff

Trouvé ce midi un article sur l'affaire Bogdanoff. C'est à lire ici :

http://www.traqueur-stellaire.net/2010/08/affaire-bogdano...