Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2023 December 26
A complex nebula is shown in front of a dense starfield.
The nebula appears orange. A bright star is seen just to the 
right of the nebula. 
Please see the explanation for more detailed information.

IC 443: The Jellyfish Nebula
Image Credit & Copyright: David Payne

Explanation: Why is this jellyfish swimming in a sea of stars? Drifting near bright star Eta Geminorum, seen at the right, the Jellyfish Nebula extends its tentacles from the bright arcing ridge of emission left of centre. In fact, the cosmic jellyfish is part of bubble-shaped supernova remnant IC 443, the expanding debris cloud from a massive star that exploded. Light from the explosion first reached planet Earth over 30,000 years ago. Like its cousin in astronomical waters, the Crab Nebula supernova remnant IC 443 is known to harbour a neutron star -- the remnant of the collapsed stellar core. The Jellyfish Nebula is about 5,000 light-years away. At that distance, the featured image would span about 140 light-years across.

Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
Tomorrow's picture: rainbow aurora


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