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Astronomy 100 Exam 4 A Name ID No notes No books You can use calculators The letter at the top of the test needs to correspond to letter at top of the answer sheet Constants that you may need to know c 3 x 108 m s G 6 67 x 10 11 m3 kg s2 h 6 626 x 10 34 J s g 9 8 m s2 5 7 x 10 8 W m2 K4 Solar Luminosity 3 8 x 1026 W 1 parsec 3 26 light years Hubble s constant 71 km s Megaparsec 1 Megaparsec one million parsecs 1 What galaxy do we reside in A B C D E Small Magellanic Cloud Whirlpool Cartwheel Andromeda Milky Way 2 What type of galaxy is the galaxy we reside in A B C D E Lenticular Irregular Elliptical Spiral Dwarf elliptical 3 The reciprocal of Hubble s constant 1 Hubble s constant gives an estimate of the the universe A B C D E size right after the Big Bang of age of critical density of time before civilizations arose in number of Galaxies in Astronomy 100 Exam 4 A 4 The two most abundant elements in our Galaxy are A oxygen and carbon B iron and hydrogen C carbon and iron D hydrogen and helium E iron and helium 5 The two most abundant elements in the Universe are A oxygen and carbon B iron and hydrogen C carbon and iron D hydrogen and helium E iron and helium 6 What is ALH 84001 Allan Hills 84001 A B C D E Largest supernova every recorded Closest galaxy to our galaxy Meteorite from Mars that was thought to contain evidence for life on Mars The black hole at the center of our galaxy Brightest quasar in the sky 7 Why are Cepheid Variables important for determining astronomical distances A Cepheid Variables are all at approximately the same distance from Earth B The period of their variability is proportional to their luminosity C All Cepheid Variables have approximately the same apparent brightness D All Cepheid Variables have approximately the same luminosity E Their age is proportional to their distance from the center of our galaxy Astronomy 100 Exam 4 A 8 The Drake equation is a simple way of trying to calculate A The age of the universe B The dimensions of the



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