Astronomy Picture of Day: Dark City New York# Astronomy - 天文
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Bright Lights, Dark City
Credit & Copyright: Bill Rosen
Explanation: Last Thursday, millions of people had an unexpectedly good view of a dark
night sky. Usually, the reflection of city lights off of local air impurities makes it hard for
casual observers to see more than a handful of stars from a bright urban area. A large power
outage in northeast North America, however, dimmed most city lights and brought
unfamiliar celestial wonders to many who looked up. The unexpected
Credit & Copyright: Bill Rosen
Explanation: Last Thursday, millions of people had an unexpectedly good view of a dark
night sky. Usually, the reflection of city lights off of local air impurities makes it hard for
casual observers to see more than a handful of stars from a bright urban area. A large power
outage in northeast North America, however, dimmed most city lights and brought
unfamiliar celestial wonders to many who looked up. The unexpected