Space News Archive - December 13, 2006
The best meteor shower of the year peaks this week on Dec. 13th and 14th. The source of the Geminids is a mysterious object named 3200 Phaethon.
Layers on Mars are yielding history lessons revealed by instruments flying overhead and rolling across the surface.
Mars is showing scientists its older, craggier face buried beneath the surface, thanks to a pioneering sounding radar co-sponsored by NASA aboard the European Space Agency's Mars Express orbiter.
- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.