Two astronomers were imaging the same globular cluster at the same time, from a continent apart, when an asteroid passed in front. Combining their images by time shows the powerful concept of parallax in astronomy:
http://www.caelumobservatory.com/gallery/zelia.shtml
The asteroid (er, I'm sorry, Small Solar System Body), was about 100 million kilometers from Earth when the images were taken.
Images taken by Adam Block, Daniel Versatche, and Bill Patterson.
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