We didn't specifically discuss this in class but the first stars to form from the cosmic microwave background were: O much less bright than modern stars because they formed during the cosmic dark ages composed of hydrogen, helium, and dark matter much larger than our Sun and hundreds of times as massive able to live for several billion years
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Q: D
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- billion .stars in the Milky Way 100 and 300 O 100 and 400 O 100 and 200 O 100 and 500 O No one of the other options O There are betweenHubble's galaxy classification diagram (the "tuning fork") O suggests the existence of black holes O shows how galaxies evolve from one form to another O relates galaxies according to their shapes, but not according to any evolutionary status O explains active galactic nuclei EGOThe discovery of the dark energy was a surprise because astrophysicists generally assumed that the expansion would be slowing down. Select one: True False
- Which one best explains dark matter? The resurgence of Newtonian physics or Einstein’s cosmological constant?How did the abundance of helium in the universe suggest the existence of the cosmic microwave background radiation?TRUE OR FALSE: In an unbounded universe, all hydrogen will be used up in about a trillion years
- What is the CMB? Group of answer choices A dense region of 4.5 million stars. A large star of 4.5 million solar masses. The cosmic microwave background of photons left over and cooled down from when the universe became transparent 300,000 years after the Big Bang. The space curvature of the universeWhy is dark energy required to explain the universe as we see it today according to the Big Bang model of the universe? 9To what does cold refer to the term "cold dark matter"? Why do models of large-scale structure agree best with the dark matter being "cold"?
- If we assume that the universe has been expanding at its current rate for its entire history, how old is the universe?If you observe light emitted from a distance object when the cosmic background temperature was Tz=54K, what is the redshift z of that light? At that redshift, what was the diameter Dz of the universe at that time compared to the diameter of today's universe D0?