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Q2: What causes the 21-cm radiation,and what is
Q3: What is stratigraphic correlation?<br>A)Dividing up rock layers
Q10: A body of related and rigorously tested
Q43: The stars that have the shortest lifetimes
Q44: Describe the stellar evolution of a low-mass
Q58: Every year,two or three supernovae are seen
Q69: The _ period on the geologic time
Q80: Pulsars are<br>A) pulsating white dwarfs.<br>B) pulsating neutron
Q107: Collisions between galaxies<br>A) do not occur because
Q122: Visible light passes more easily though dust