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How does an interstellar cloud collapse to become a star?
Q42: The statement that the apparent magnitude of
Q64: If a protostar were able to contract
Q92: Which phenomenon on the Sun does NOT
Q169: The star Arietis has an apparent magnitude
Q195: What is the typical mass of a
Q203: Helium nuclear reactions take place in a
Q214: What condition is considered sufficient for an
Q219: What radiation ionizes the hydrogen in an
Q225: A stellar core of about 2 solar
Q252: In which regions of the Milky Way