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.

The animated GIF may be little appreciated in the world of Web 2.0�but in the right hands, it plays with the unsettling riddle of our mechanical nature.

The Red Planet has been the object of science fiction, paranoia, and fakery. And with numerous spacecraft now beaming back publicly-available images from our neighboring planet, Martian fantasizing is a growth industry. This film is one of the most convincing, and it isn't even from Mars. Video after the jump.

The Tokyo-based Shimizu Corporation is one of the world's leading construction and engineering contractors. It's also a prolific producer of corporate science fiction: fanciful, high-concept design projects that offer glimpses of astonishing futures. Its "Luna Ring" envisions such a future for the moon�and for Shimizu.

It's sumptuous and elegant. But what is it�a puzzle or game? A clockwork cribbage player? A static electricity generator? Answer after the jump.

Pluto's loss of planetary status seemed to have been sealed by the 2006 discovery of a batch of similarly-sized planet-like objects in the same orbital neighborhood�one of which, later named Eris, was thought to be larger than erstwhile ninth planet. According to new findings, however, Pluto's diameter is larger than that of its more massive neigbhor. For now, Pluto gains in status as the largest of these so-called dwarf planets. Whether this will be enough to secure a record contract remains to be seen.