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The rotation curve for our Galaxy shows stars beyond the Sun moving slower than expected.
Q19: A proposed explanation for gamma-ray bursters is:<br>A)
Q33: Henrietta Leavitt's period-luminosity relation for _ indicates
Q74: Of the normal elements around us,the Big
Q81: The core of the Milky Way,Sagittarius A,is
Q83: The Big Bang formed:<br>A) only hydrogen.<br>B) only
Q87: How are Cepheids and RR Lyrae stars
Q88: The low density universe is an open
Q94: The energy radiated by a typical quasar
Q98: Both protons and neutrons (and their anti-particles)froze
Q101: What characteristic of a star cluster is