Physics, 17.03.2020 17:25 dolphinfan321

Why do the moon phases take two days longer than it takes for the moon to revolve around Earth?

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Physics, 23.06.2019 00:30, fattypickeltoefungus

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.