How old are the Sun and the Earth?

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Offline Solium

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How old are the Sun and the Earth?
« on: 21/03/2013 21:37:00 »
New member, first question.  :)

I've heard the Earth is 4.5 billion years old. I also heard the same about the Sun.
(Though I've also read the Sun is a half billion years older.)

That said, how can the Earth and Sun be the same age? Didn't it take much longer for the Sun to form? And didn't the planets form from the left over material the Sun didn't consume?
« Last Edit: 24/03/2013 23:35:40 by chris »

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Offline Soul Surfer

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Re: Age of the Sun and Earth- Clarification Needed
« Reply #1 on: 23/03/2013 23:23:46 »
Once it starts the later stages of gravitatonal collapse are very quick.

In the context of a 4.5 billion year life, the formation time of stars and planetary systems is very short, taking only a few million years at the most.  Some of the biggest and brightest stars have lives from formation to self destruction in a supernova of around 10 million years
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