a: star ~
b: a gigantic H-bomb held together by its own gravity
What:
"Like the sun, they begin life as cloud of gas that collapses and heats up until the hydrogen in its core "catches fire" and starts fusing into helium, like a gigantic H-bomb held together by its own gravity. The core is surrounded by a envelope of cooler gas that transmits energy to the surface by convection and radiation, but doesn't actually do any fusion itself."
Useful?
Writer: John Baez
LCC:
Where:
Date: Apr 27 2016 6:53 PM
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