You live in a Universe where matter dominates significantly over antimatter.

The disk of the galaxy is older than the halo.

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.

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

The inflationary theory of the Universe may explain why the background radiation is so isotropic.

This star-like radio-quiet object shown above in visual wavelengths is actually a/an _____________.

The Local Group of galaxies is dominated by the presence of spiral galaxies.

If matter and antimatter combine, the result is energy.

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