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Which trigger could start the gravitational contraction of a molecular cloud?
Q6: Eighty percent of the stars on the
Q9: Schwarzschild showed how the _ of the
Q10: Briefly describe the characteristics of an elliptical
Q13: Supernovae can trigger star formation.
Q23: Jenny, who lives on a farm in
Q36: The broad emission lines of Seyfert galaxies
Q39: It is possible for a medium-mass star
Q46: The circular velocity of a satellite orbiting
Q53: The first confirmed black hole, Cygnus X-1,
Q65: The luminosity of a Seyfert galaxy varies