IC 443 (also known as the Jellyfish Nebula) is a Galactic supernova remnant (SNR)
in the constellation Gemini. On the plan of the sky, it is located near the star
Eta Geminorum. Its distance is roughly 5,000 light years (~5×1016 km) from Earth.
IC 443 is thought to be the remains of a supernova occurred 3,000 - 30,000 years ago.
The same supernova event likely created the neutron star CXOU J061705.3+222127,
the collapsed remnant of the stellar core.

IC 443 is one of the best-studied case of supernova remnant interacting
with surrounding molecular clouds. (source: Wikipedia)

Jellyfish imaged last year with smaller ccd, http://www.pbase.com/steelnavy/image/73054562