SpaceNearby asteroid found orbiting sun backwards A newly discovered near-Earth asteroid that travels in a 'retrograde' orbit has astronomers puzzled – they think the 2- to 3-km-wide object should have been seen before News
SpaceSubsurface ice on Mars exposed by recent impacts Several small space rocks that hit Mars in 2008 blasted away topsoil to reveal a layer of water ice lying just below the planet's surface News