The Jellyfish Nebula in Gemini (more mundanely known as IC 443) is the remnant of a supernova that occurred approximately 30,000 years ago. The shock wave impacted the surrounding dust and gas in the region, causing its delicate tendrils to glow. All that is left of the progenitor is a tiny neutron star.
The original H-alpha image is here.
Takahashi Sky 90 at f/4.5
SBIG STL-4020M + remote
Hutech LPS Filter
Ha: 12 hours (20 minute subexposures)
RGB: 45 minutes each channel (5 minute subexposures)
Processed in Maxim/DL, CCDStack, and Photoshop
Noel Carboni's Astronomy Tools Actions