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  1. What is a nebula?
  2. How are stars formed?

Asked by Topperlearning User 6th April 2015, 3:20 PM
Answered by Expert
  1. A cloud made up of gases and dust in outer space is known as nebula. It is believed to be the birthplace of stars.
  2. Particles of dust and gases are drawn together by their own gravity. Due to an extremely high pressure, the gases begin to burn at the centre with a very high temperature. Once the temperature reaches above 10 million degrees centigrade, nuclear reactions begin to take place resulting in the formation of stars.
Answered by Expert 6th April 2015, 5:20 PM
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