MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Emission nebula. Computer artwork of an emission nebula. Nebulae are huge clouds of interstellar gas and dust. Emission nebulae are starbirth regions that glow red due to the ionisation of hydrogen gas by radiation from hot young stars at the nebula's centre. Strong stellar winds sculpt the surrounding gas and dust into shapes, which often provide emission nebulae with their names.
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