In astronomy, an inner moon is a natural satellite following a prograde, low-inclination orbit inwards of the large satellites of the parent planet. They are generally thought to have been formed in situ at the same time as the coalescence of the original planet. Neptune's moons are an exception, as they are likely reaggregates of the pieces of the original bodies, which were disrupted after the capture of the large moon Triton. Inner satellites are distinguished from other regular satellites by their proximity to the parent planet, their short orbital periods (usually under a day), their low mass, small size, and irregular shapes.
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Famous quotes containing the word moon:
“Since the war nothing is so really frightening not the dark not alone in a room or anything on a road or a dog or a moon but two things, yes, indigestion and high places they are frightening.”
—Gertrude Stein (1874–1946)