The largest voids may span 300 million light-years across.
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Q17: While quasars may have now vanished, the
Q18: Spiral galaxies are much more common in
Q19: For nearby spirals, their rotation curves help
Q20: It is now believed the majority of
Q21: Due to the galaxy density and collisions,
Q23: Based on galactic rotation curves and cluster
Q24: Gravity lensing lets us map the distribution
Q25: The distance between adjacent galaxies in a
Q26: As we look at larger and larger
Q27: How massive are the largest known galaxies?
A)a
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