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Q24: The expansion of the universe takes place<br>A)
Q48: A moving electron in a magnetic field
Q86: A close encounter between two galaxies is
Q95: The orbits of stars around the center
Q106: The energy output per second of a
Q110: Interstellar matter obscures Earth's view of the
Q121: A rich, regular cluster of galaxies differs
Q135: Expansion under high pressure and temperature results
Q170: Why do the spiral arms show up
Q174: What do superstring theories try to explain?<br>A)