Sunday, April 25, 2010

Astronomy and Overnight Thread


Planetary Nebula Mz3: The Ant Nebula
Credit: R. Sahai (JPL) et al., Hubble Heritage Team, ESA, NASA
Explanation: Why isn't this ant a big sphere? Planetary nebula Mz3 is being cast off by a star similar to our Sun that is, surely, round. Why then would the gas that is streaming away create an ant-shaped nebula that is distinctly not round? Clues might include the high 1000-kilometer per second speed of the expelled gas, the light-year long length of the structure, and the magnetism of the star visible above at the nebula's center. One possible answer is that Mz3 is hiding a second, dimmer star that orbits close in to the bright star.
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