Space

Advanced nuclear rockets could carry astronauts to Mars and beyond

New 'cosmic candle' could help explain dark matter

Asteroid Apophis passes safely past Earth

'Eye of Sauron' hosts rogue planet

Revealing the 'skeleton' of the Milky Way

Vega encircled by asteroid belt

The black holes of the Caldwell 5 spiral galaxy

Curiosity sweeps rock clean for test

Mars mission simulation reveals serious sleep problems

'Billions' of planets in habitable zones, says NASA