PHSC 102 Final pt. 2 Questions with Correct Answers

PHSC 102 Final pt. 2 Questions with Correct Answers What perception of the Milky Way Galaxy did astronomers have in 1900? - Answer-They believed that the Milky Way was the entire universe Globular clusters are mainly found - Answer-in the Galactic halo The period-luminosity relation was discovered in 1908 by - Answer-Henrietta Leavitt Match the property with structures of the galaxy. - Answer-Galactic bulge - contains the super massive black hole in the center Galactic disk - has sprial arms Galactic halo - contains the oldest stars Why was Herschel's strategy for mapping our Galaxy flawed? - Answer-He assumed all stars have the same brightness. He did not account for extinction. He assumed the Sun was in the center. The Galactic Year, the time for our solar system to orbit the Galaxy, is about - Answer-225 million years Most of the mass of the Milky Way seems to exist in the form of - Answer-dark matter out in the Halo. ______ proved that the spiral nebulae were other galaxies. - Answer-Edwin Hubble Most of the new star formation in the Galaxy is found in the - Answer-spiral arms The radio source ________ is located in a place consistent with the center of our Galaxy. - Answer-Sgr A* While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is moving towards us. - Answer-false