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Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula.
Q27: Right ascension in the sky is very
Q54: Like emission nebulae, planetary nebulae glow because
Q68: The last quarter moon rises tonight about
Q76: The twelve constellations through which the Sun
Q94: To the outer edge of the Galaxy,
Q104: In a hypernova, a very energetic supernova
Q120: A typical protostar may be several thousand
Q139: Of the elements in your body, the
Q155: While luminous enough to be seen with
Q155: The radio source is located in a