IC443 also know as the Jellyfish Nebula is a supernova remnant in the constellation of Gemini, approx. 5000 light-years from Earth. This nebula was formed by an exploding supernova 3000 - 30 000 years ago, the exact age is unknown to this day. This explosion was likely to be a Type II supernova and it also created a neutron star that is moving away from the nebula 800 000 km/h. The nebulosity itself is 70 light-years across and it covers area larger than a full moon in the sky. A closer look at the nebula's shape is also intresting. One portion of the cloud seems very dense - almost ring like while other parts seem to vanish into interstellar space. This is because the nebula is interacting with a cloud of neutral hydrogen - which is a considerably less dense enviroment. This allows the shockwave in the other side to travel faster than the other side of the shockwave, which is being compressed by gasses and dust around it.
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