A star is a massive,
luminous sphere of plasma held together by its own gravity. The nearest star to
Earth is the Sun, which is the source of most of the planet's energy. Some
other stars are visible from Earth during the night, appearing as a multitude
of fixed luminous points due to their immense distance. Historically, the most
prominent stars were grouped into constellations and asterisms, and the
brightest stars gained proper names. Source
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