The Heart Nebula

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The Heart Nebula, IC 1805 lies 7500 light years away in the constellation Cassiopeia. Its an emission nebula showing glowing gas and darker dust lanes. 

The nebula is formed by plasma of ionized hydrogen and free electrons. It's intense red output and configuration are driven by the radiation emanating from a small group of stars near it's center.

This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun and many more dim stars that are only a fraction of our Sun's mass. The cluster used to contain a microquasar that was expelled millions of years ago.

The very brightest part of this nebula [the knot at the right] is separately classified as NGC 896, as it was the first part of this nebula to be discovered.

source:- wikipedia


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