Cosmology

1. Suggested that the universe is infinite in extent, has no beginning, and is static.
7. A universe that collapses after an initial period of expansion.
9. The _____________ principle uses homogeneity and isotropy and has had a profound role in the development of cosmology.
11. Formulated three solutions for the equations for the evolution of the universe.
13. All-permeating vacuum energy filling the universe.
14. His paradox asks why the sky is so dark.
15. Term indicating that radiation is the same in all directions.

2. Acronym representing non-baryonic, weakly interacting massive particles.
3. A universe that continues to expand forever.
4. Its value is about 10^-26 kg m^-3.
5. A large group of galaxies.
6. Acronym representing massive compact halo objects.
8. On a large scale, the universe appears _______________.
10. Evidence for this theory includes expansion of the universe, the cosmic microwave background, and abundance of helium.
12. Hubble interpreted this as evidence that galaxies are moving away from us.