The day the sun dies


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yahoo.com
Scientists work out what will happen when the sun dies

Professor Albert Zijslra says, ‘When a star dies it ejects a mass of gas and dust – known as its envelope – into space.

‘The envelope can be as much as half the star’s mass. This reveals the star’s core, which by this point in the star’s life is running out of fuel, eventually turning off and before finally dying.

‘It is only then the hot core makes the ejected envelope shine brightly for around 10,000 years – a brief period in astronomy. This is what makes the planetary nebula visible.

‘Some are so bright that they can be seen from extremely large distances measuring tens of millions of light years, where the star itself would have been much too faint to see.’

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