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The density wave theory attempts to explain why the spiral arm structure persists over a long time.
Q6: Why might the Cassini- Huygens probe to
Q13: Einstein's constant has been revived to help
Q24: The density wave theory attempts to explain
Q38: If Euclid is right, then ▲o is<br>A)
Q43: What does Hubble's law imply about the
Q59: How massive are the largest known galaxies?<br>A)
Q97: In the Big Bang model, two possible
Q118: A 20- solar- mass star will stay
Q123: The dark halo is now believed to
Q163: Like Herbig- Haro objects associated with protostars,