The word can be sourced all the way back to the Proto-Indo-European *ster-, meaning “star,” combined with *-eidos, which means “form” or “shape.”, Asteroid, Their name comes from the Greek word komē, which means “long hair.”, Comet, It combines the prefix com, meaning “together,” with stellare, the past participle of “to shine,” which itself derives from stella (“star”)., Constellation, It comes from the Greek *****, meaning “order” or “world”, Cosmos, English’s word comes from the Proto-Germanic ertho, which was indeed a word for “dirt” or “soil.”, Earth, Traces back to ancient Greece, where the word for milk was gala, Galaxy, This word is also the root of “month,” and is itself derived from the Proto-Indo-European me-, which meant “to measure.”, Moon.

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