In the collapse of a protostar ____________________ energy is converted to ____________________ energy.
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Q76: The interstellar medium is made of _.
A)gas
B)dust
C)gas
Q77: A spectral line produced in the atmosphere
Q78: To initiate star formation in a cloud,
Q79: How long can a four-solar-mass star live
A)1
Q80: A star has crossed the birth line
Q82: The Sun has a core in which
Q83: Ninety percent of all stars fuse helium
Q84: The Sun makes most of its energy
Q85: A(n) _ is a cool, dense cloud
Q86: Most stars generate their energy by the
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