The redshifts of the galaxies imply that the Universe is expanding and that we are at the center.

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

If the Universe is closed, then its age will be

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

The period-luminosity relationship is primarily used for main-sequence stars.

If the Universe were infinitely large, infinitely old, and static, then the CMB would appear uniform (i.e., homogenous and isotropic).

By adding the cosmological constant, Einstein made the universe steady in that the Universe neither expanded nor contracted.

The ___________ view of the Universe is that it is eternal and unchanging.

Stars are eternal and unchanging in your lifetime but not over a star’s lifetime

The assumption of homogeneity states that