SpaceAsteroid bound for Earth! Warn your grandchildren An asteroid that had initially been thought harmless might just hit Earth 160 years from now 51¶¯Âþ
SpaceBig bang's afterglow may reveal birthplace of comets A shell of icy bodies called the Oort Cloud is too far away to see – but its signature may be hidden in remnant radiation from the big bang 51¶¯Âþ