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One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.
Q7: When a gas is so dense that
Q12: Which type of nebulaeare twisted and distorted
Q13: The corona can reach temperatures of up
Q32: Light gathering power and resolving power both
Q36: Where would you most likely find a
Q46: A star with the mass of our
Q47: Quasars are caused by galaxy collisions in
Q49: What part of the Copernican model was
Q57: The _ of the solar disk is
Q62: How is the Sun's rotation different than