Integration: 16.7 hours
Avg. Moon age: 5.40 days
Avg. Moon phase: 35.42%
Astrometry.net job: 278711
RA center: 303.002 degrees
DEC center: 38.418 degrees
Orientation: 90.525 degrees
Field radius: 0.567 degrees
Locations: San Jose, CA, San Jose, California, United States
250,000 - 400,000 years ago, the star in the middle of this Crescent Nebula (number HD192163) turned into a red giant. As a result, the star expanded rapidly, burned hotter and shed lots of material. Later, it became a so-called Wolf Rayet star burning even hotter and shedding more material faster. The Crescent nebula is from the area where the second, faster wave hits the first, slightly slower wave. The interaction of the two waves makes the material glow.
What's even more exciting, this star will become a supernova - we just don't know when. Also, because of its distance of 5000 light years, the supernova might have already happened. We just haven't seen it yet.
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