LifeDon't send bugs to Mars A plan to send live microbes to the Red Planet's largest moon risks wrecking our search for extraterrestrial life, argues Barry E. DiGregorioComment
SpaceFormer 'tenth planet' may be smaller than Pluto Eris, a distant body that triggered the debate about what constitutes a planet, may actually be smaller than Pluto, according to new observations 51¶¯Âþ