Distance Based on the graph above, the expansion rate of galaxies near us is than galaxies that are farther away. O faster O slower O the same rate Velocity
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- 1. Assuming a spatially flat Universe, find the time dependence of: (a) the density of matter when the Universe is radiation dominated and (b) the density of radiation when the Universe is matter dominated.B6A galaxy containing HI gas is moving with a velocity of 150 km/s away fromus (along the line of sight). Calculate the frequency at which we will observethe HI emission line.
- A 50 g tennis ball revolves around a 2-kg bowling ball in a universe that is otherwise empty. If the orbit is circular with radius of 10 m, calculate: a) The speed of the tennis ball b) The period of its motion Take the tennis ball and the bowling ball as particles.Suppose an alien race on a distant planet tries to send a message to us, with a laser (light). However, we were unaware that there is a stellar-mass black hole almost directly between us and them. How would this complicate our attempts to locate their position in the Galaxy? O Gravitational lensing would make the signal appear to be coming from a different location O The information carried by the laser (light) would be altered O It would not matter The black hole absorbs all of the lightThe density of the universe is a. equal to the critical density if the universe is closed. b. equal to the critical density if the universe is flat. c. greater than the critical density if the universe is flat. d. greater than the critical density if the universe is open. e. none of the above.
- Why is it difficult to study our own galaxy? O The sun obscures the view O We are within it and thus cannot see it from the outside O Earth's position is not ideal compared to other planets (within the galaxy) for viewing our galaxy O Parts of it are too far away to seeOver the lifetime of the Universe, the dynamics of its expansion are dominated by the density of different constituents at different times. Ignoring expansion, what is the proper order for which constituent dominates from early to later times? Select one: a. First matter, then dark energy, then radiation b. First radiation, then matter, then dark energy c. First dark energy, then radiation, then matter d. First radiation, then dark energy, then matter