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发帖数: 1994 | 1 Moon Over Andromeda
Credit & Copyright: Adam Block and Tim Puckett
Explanation: The Great Spiral Galaxy in Andromeda (aka M31), a mere 2.5
million light-years distant, is the closest large spiral to our own Milky
Way. Andromeda is visible to the unaided eye as a small, faint, fuzzy patch,
but because its surface brightness is so low, casual skygazers can't
appreciate the galaxy's impressive extent in planet Earth's sky. This
entertaining composite image compares the angular size of the nearby ga |
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