how big are stars?

Universe Size Comparison 3D

They may contain the mass of one or two Suns but are often just 20 to 40 km in diameter. White dwarf stars are a bit bigger – often similar in size to our planet Earth. The largest supergiant stars can be more than 1500 times larger than our Sun. This makes them over 2,000 million km across.

The Largest Star in the Universe – Size Comparison

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