Image taken by Subaru Telescope shows comet -shaped knots lighting up the Helix nebula.
A nebula is cloud of gas and dust in space. Some nebulas are regions where new stars are being formed, while others are the remains of dead or dying stars. Nebulas come in many shapes and sizes. There are four different types of nebulas- planetary , reflection, emision and absorption nebulas.
Helix nebula is located about 710 light years from Earth and was first planetary nebula in which knots were abserved.
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