ASTRO 7N UNIT 4 PART 2 Quiz -Solved How could the universe be accelerating, despite the gravitational pull of all the matter in it? - ANSWER-There could be a new force or property of space that affects the universe on its largest scales.How did conditions differ from the present era when the Universe was young? - ANSWER-The young Universe was hotter, more dense, and smoother How do we know that the universe's expansion is speeding up? - ANSWER-We look at objects from different times in the past to see how expansion changes with time How do you measure the speed of a galaxy relative to you? - ANSWER-Doppler shifts How have astronomers interpreted the unexpectedly fast rotation of galaxies? - ANSWER-There must be a lot of dark matter whose gravity can be felt but not seen How many types of fundamental particles exist? - ANSWER-30 How many types of quarks are there and how many types of anti quarks - ANSWER-6 quarks and 6 anti quarks Now what happens because of the formation of atoms? - ANSWER-The cosmic microwave background is produced What forms in nucleosynthesis? - ANSWER-Most of the Helium-4 in the Universe What is a quasar? - ANSWER-A very luminous source due to a black hole at the center of a galaxy that is quickly growing What is Hubble's law? - ANSWER-The faster a galaxy is moving, the farther away it is.What kind of particle carries the force? - ANSWER-Boson What parameters do Hubble's law relate to each other? - ANSWER-galaxy recession velocity and distance What technique for measuring distance can you use to discover Hubble's law? - ANSWER-Cepheid variables in galaxies white dwarf supernovae in galaxies A&B Where is the center of the Universe? - ANSWER-There is no center to the Universe.Expansion is happening everywhere.
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