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Red giant

The small white star on the left is the sun the way it is now. The large red star on the right is what the sun will look like when it turns into a red giant.

A red giant is a giant star that has the mass of about one-half to ten times the mass of our Sun. Red giants get their name because they appear to be colored red and they are very large. Many red giants could fit thousands and thousands of suns like ours inside of them.

Right now, our Sun is a main-sequence star, not a red giant. However, five billion years from now, scientists believe our sun will become a red giant. It will be about 200 times bigger in diameter than it is now. It will become so big it will swallow up Mercury, Venus and possibly the Earth.[1][2]

  1. ↑ Though their orbits will be further out than at present.
  2. ↑ Jones M.I. et al 2014. The properties of planets around giant stars. Astronomy & Astrophysics 566: A113. [1]
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