Deep in Mars' past, an asteroid struck the planet with such titanic force that it could've killed off the planet's entire magnetic field, according to a new study.

Science editor Alan Boyle's blog: After a decade of tinkering, NASA has successfully conducted the first deep-space test of a protocol designed to accommodate an interplanetary Internet.

Flight controllers were revamping plans Wednesday for the remaining spacewalks planned during space shuttle Endeavour's visit to the international space station, after a crucial tool bag floated out to space during a repair trip.

A pair of orb weaver spiders flying aboard the International Space Station have fought a battle with weightlessness and lost.

Strange weather on the icy dwarf planet Eris could be causing changes that scientists are now seeing at the methane-ice surface of this distant object in our solar system.