9 Jan 2013: The Elusive Jellyfish Nebula
Left of center in this image is the jellyfish nebula which is very hard to view. The tentacles which gave it its name were created about 3000 years ago by a supernova explosion. The bright star on the right is Eta Geminorum, part of what is often called the "celestial twin." The first light from this nebula probably reached Earth about 30,000 years ago which means it is at least that old. Similar to the crab nebula, which I wrote an APOD about a while back, this nebula has a neutron star which is a remnant of a collapsed stellar core.
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