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What Is a Nebula?
The closest nebula to Earth is the Helix Nebula, which is about 700 light years away from Earth. Space telescopes are invaluable for studying nebulae, which are often faint and dim. Earth's ...
NGC 7293, better known as the Helix nebula, displays its ultraviolet glow courtesy of NASA's Galaxy Evolution Explorer (GALEX).
Discovered in the 18th century, the Helix Nebula, located about 700 light-years away in the constellation Aquarius, belongs ...