Question 1 Not yet answered Marked out of 1.00 What is the Fermi Paradox? Select

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Question 1 Not yet answered Marked out of 1.00 What is the Fermi Paradox? Select one: a. We should 0 b. Based on an optimistic Drake Equation and the time it takes to colonize the Galaxy, then aliens should be on Earth already, but they are not. see UFOs frequently, but we do not. Flag question Edit question O c. Using a simple estimate on how long it would take to colonize the Solar System combined with the estimate on the lifetime of a civilization, we would expect any alien civilization to have built a very large telescope that can transmit signals across the galaxy, then alien radio signals should be common, but they are not. 0 d. Based on our estimate for life, we should see life on nearly every moon in the Solar System, but we have not. Question 2 Not yet answered Marked out of 100 Select one What is powering quasars? Flag question a black holes 5 Edit questionb.galaxy rotation O c. galaxy collisions O d. massive stars and their luminosity O e. supermassive black holes Question 3 Not yet answered Marked out of 1.00 pFlag question We can not see light from the Big Bang until 380,000 years after the event because Select one: d a. our telescopes are not sensitive enough to detect it. b, the Universe was too dense. Edit question O c. the light was faster than the size of the Universe, so it is impossible to see. 0 d. before then the light was energetic enough to ionize hydrogen atoms. An astronomer is using the radial velocity method to detect a new planet. He detects a wobble with a period of 2 months. What is the period of the Question4 Not yet answered Marked out of 1.00 Flag question Edit question lanet? Select one: 0 a. 1 month 0 b. 2 months O c. 0 d. 4 months Unless the inclination is known, we can not b e sure. Question 5 Not yet answered Marked out of 1.00 An astronomer is using the transit method to detect a new planet. She detects two transits on the same star-- two planets! The first planet has twice the drop in starlight as the second planet. What does that mean?

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Question 1 Not yet answered Marked out of 1.00 What is the Fermi Paradox? Select

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