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Notice the comparison in size between our sun and a red giant. The volume (size) changes, but the mass between the two stays the same.

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A great deal of the time, stars are found in binary systems. This means two stars are orbiting each other within their own gravitational pulls. Among the most common binary systems are red giants and white dwarf stars. Even though a white dwarf is roughly the size of Earth, its gravity is so strong that it pulls matter from a red giant and surrounds itself with something called an accretion disc.

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Regardless of a star's mass, it will eventually stop its hydrogen fusion and be comprised entirely helium. The star will begin to expand and grow in size exponentially. Our sun will eventually get so large that it will engulf the inner planets (Mercury to Mars).

A red super giant will grow even larger, and these are the result of a high mass star ending its hydrogen fusion. If a red super giant were to replace our sun, its edge could potentially reach Jupiter (approximately 800,000,000 miles across!).

Strangely enough, even though these stars increase their volume (grow in size), their mass does not change!