Star Size Comparison (HD)
Our small world - The size of planets and stars in scale.
A star is a massive, luminous ball of plasma held together by gravity.
The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible from Earth during the night when they are not outshone by the Sun or blocked by atmospheric phenomena.
A star shines due to thermonuclear fusion of hydrogen in its core releasing energy that traverses the star's interior and then radiates into outer space.
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