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Old 04-19-2018, 08:13 PM   #1391 (permalink)
freebeard
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How it was 2 billion years ago, is the question.
Why?

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And perhaps how it was 120 million years ago.
Why?

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Originally Posted by Wikipedia
Life phases
Main articles: Formation and evolution of the Solar System and Stellar evolution

The Sun today is roughly halfway through the most stable part of its life. It has not changed dramatically for over four billion[a] years, and will remain fairly stable for more than five billion more. However, after hydrogen fusion in its core has stopped, the Sun will undergo severe changes, both internally and externally.
The plasma connection to the wider Galaxy will persist.

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