Many disk galaxies, such as Andromeda and the Milky Way, are ...

[DyllonKazuo]

Many disk galaxies, such as Andromeda and the Milky Way, are thought to have extended halos of dark matter because the disk circular orbital speed is observed to ____________ increasing distances from the disk center.
 
  a. stay constant with
  b. decrease with
  c. be totally absent at

Question 2

If the theory that novae occur in close binary systems is correct, then recurrent novae should
 
  a. produce synchrotron radiation.
  b. occur in regions of star formation.
  c. not occur in old star clusters.
  d. all be visual binaries.
  e. repeat after some interval.

[katieost]

Answer to Question 1

a

Answer to Question 2

e

[DyllonKazuo]

Thanks

[katieost]

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