Hubble's law was discovered using measurements of two properties of a galaxy _______ and _______.	Multiple Choice
02Using the following graph and Hubble's law, determine approximately how fast a galaxy at a distance of 225 Mpc would be moving away from the Earth.	Numeric Entry
03The Hubble constant is found from the	Multiple Choice
04The best evidence for dark matter in the Milky Way comes from the observation that the rotation curve	Multiple Choice
05Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars _________ far from the center of the galaxy.	Multiple Choice
06In the context of spiral galaxies, Kepler's laws could be used to estimate	Multiple Choice
07Which property is detectable for both dark matter and the supermassive black hole at the center of the Milky Way	Multiple Choice
08Hubble's law and the Big Bang theory are related because	Multiple Choice
09Watch the Astronomy in Action video about the observable versus the actual universe, and answer the following question. I f you have trouble loading the video or would like to open it in a new tab, please click. The actual universe is likely __________ the observable universe.	Multiple Choice
10Watch the Astronomy in Action video about the expanding balloon universe, and answer the following question. If you have trouble loading the video or would like to open it in a new tab, please click. The surface of the balloon is a two-dimensional representation of	Multiple Choice
11The Big Bang theory predicted	Multiple Select
12When they look into the universe; astronomers observe that nearly all galaxies are moving away from the Milky Way. This observation suggests that	Multiple Choice
13Sort the following statements as either correct or incorrect, based on what is being illustrated in the figure.	Sorting
14The CMB and the Big Bang theory are related because	Multiple Choice
15To try to determine the eventual fate of the universe, scientists defined a quantity called the critical density c as the borderline density the universe would have if all its mass caused the expansion from the Big Bang to slow forever, coming close to a stop but never quite reaching it. We can then compare the actual density of the universe to this using a ratio Omega textmass=fracrhorho_textcThere are three main fates for the universe based on the value of mass, as demonstrated by the three lines on the following plot. The plot shows how the scale factor overall size of the universe would change with time for different values of mass. Drag each of the possible values for mass onto the appropriate target for the line on the plot to which that value would correspond.	Labeling
16Watch the Astronomy in Action video about the actual versus the observable universe and answer the following question. If you have trouble loading the video or would like to open it in a new tab, please click. edge of the observable universe is	Multiple Choice
17The CMB includes information about	Multiple Select
18Dark energy has been hypothesized to solve which problem	Multiple Choice
19If there is enough mass in the universe such that the density is higher than the critical density, the universe will	Multiple Choice
20Label the different possible outcomes for the universe within the figure.	Labeling
21What set of circumstances would certainly cause an expanding universe to reverse its expansion and end up ina Big Crunch	Multiple Select
22There are several methods of extrasolar planet detection currently in use. Which properties of a planet does each method discover Sort the following methods into the appropriate categories.	Sorting