记录
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Hubble Peers into the Most Crowded Place in the Milky Way
The Arches Cluster, the densest known star cluster in the Milky Way, about 25,000 light-years from Earth, a fairly young astronomical object at between two and four million years old. -
- andrew: President Obama liked the photo and tweeted about ithttps://twitter.com/POTUS/status/606226830241046528
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brav: spectacularly marvelous!
