UPDATE: Ground controllers re-established full links Sunday with a European-Russian Mars orbiter which worryingly stopped sending status updates after releasing a lander on a three-day trek to the Red Planet's surface.
How do you make half the mass of two continents disappear? To answer that question, you first need to discover that it's missing.
We don't want to scare you, but our own Milky Way is on a collision course with Andromeda, the closest spiral galaxy to our own. At some point during the next few billion years, our galaxy and Andromeda – which also happen ...
The European Space Agency says it has lost contact with its Rosetta probe after it hit the surface of a comet, marking the planned end of a 12-year mission.
Part of the Anti-Atlas mountains bordering the Sahara Desert in western Algeria is pictured in this satellite image.