Cosmology Vocab

2. A universe where space-time is not curved
5. The stage were ultraviolet photons ionized gas filling space
6. A universe with zero curvature and is infinite
7. The process where protons capture and hold electrons to make neutral hydrogen
8. Almost all the protons electrons and neutrons were made during this time of the universe
9. These two people discovered Cosmic Microwave Background Radiation
12. A universe that curves back on itself but is still infinite
14. This is the largest known structure in the Universe
17. The force of repulsion between galaxies so the universe does not contract or expand
18. By this time of the universe all nuclear reactions have ended
19. The Big Bang left hot clouds that give off radiation. What is this radiation called?

1. The universe average density of 9x10^27 kg/m^3
3. Matter that does not contain protons and neutrons
4. Protons and neutrons were able to link and for deuterium during what time of the universe
10. The estimated age of the universe relating to the expansion rate
11. When looking at the sky you see stars in every direction. This tells us that the Universe is
13. We can say many mixtures, ex. sugar and water, have a uniform composition. What is another word to describe uniform composition?
15. Energy that accelerates the Universe but does not contribute to anything else
16. Matter composed of subatomic particles