Astonishing caverns near the Ascraeus volcano on Mars aren't the holes left by Frank Herbert's sandworms, but they may evince past volcanic activity.

In space, no one can hear you munch your popcorn. Video after the jump.

The Pioneer anomaly, a long-discussed discrepancy between the expected and actual speeds of the Pioneer spacecraft, has tantalized researchers with the possibility of an exotic new physics. A solution may be close at hand�and even if it supports the standard model, it's pretty amazing.

An ancient device for predicting the occurrence of solar eclipses gets a fun, lucid reboot�in interlocking plastic blocks.

We've met the shadow biosphere, and it is us.

he Cassini spacecraft has detected atmospheric oxygen on Rhea, a rocky, icy moon orbiting Saturn. 950 miles in diameter (less than half that of our moon), the tiny world is covered with water ice, which likely produces free oxygen as it is bombarded with charged particles from the magnetosphere of its parent planet, Saturn.

In the space tourism era, with CEOs spending millions to be hoisted into the heavens, he was the first true empty suit in space.

NASA's latest nanosatellites seek answers to questions about the place of life in the universe�at a very small scale.

The search for extraterrestrial life is serious science: its methods are precisely documented, its results painstakingly peer-reviewed. But at the same time it�s a field with curious standards when it comes to �advances.�

3-D printing is going viral. With 3-D fabrication technology at for the desktop, for LEGOs, and for nanoscale materials, it was only a matter of time before the paradigm found its way into space�and corporate science fiction. But this promising technology still has to prove itself in terrestrial infrastructure first.