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Galaxies in clusters are much more likely to become "active" than ones alone in space.
Q41: Population I stars came billions of years
Q47: The idea of rapidly rotating white dwarf
Q51: Assuming the conditions ripe for life and
Q51: The rotation curve for our Galaxy shows
Q77: Almost all active galactic nuclei seem to
Q80: While yet unproven, the proposed WIMPS would
Q82: Novae always occur in a close binary
Q96: The cosmological redshift is a direct measure
Q98: Which classes of stars with large habitable
Q106: Why is it thought that quasars probably