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How many Earths can you fit inside the sun?

You could fit nearly one million Earth-sized planets and the sun isn't even that big of a star.

How hot is the sun?

I have it on very good authority that it's more than 20 degrees, for sure.

When will the Sun run out of fuel?

The Sun has enough hydrogen fuel to last it another 5 billion years. However, life on Earth might become extinct as early as 1 billion years from now.