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According to the ages of the globular clusters, our Galaxy is about times as old as the solar system.
Q3: Emission nebulae like M42 occur only near
Q7: A neutron star rapidly.
Q11: Most of the new star formation in
Q36: How can the image of a single
Q44: The "Great Wall" is the structure in
Q47: Seyferts are irregular galaxies with very strong
Q49: It is currently believed that superclusters lie
Q60: The star Arcturus shows a large proper
Q78: Of what is the galactic halo composed?
Q96: Galactic evolution is due to collisions between