Astronomy: Our Cosmic Address – Flashcards
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From the fact that virtually every galaxy is moving away from us and some distant galaxies are moving away from us at a faster rate than closer ones, we conclude that the the universe is ________
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expanding
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used to measure large distances
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light year
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disk shaped, 100000 light years in diameter, dim/milky haze, giant spiral, bulge in middle
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Milky Way Galaxy
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How many stars are in the Milky Way Galaxy?
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100 billion +
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How many galaxies are there in the observable universe?
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100 billion
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How far is a light year in kilometers?
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9.461 x 10^12
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If you represented each star by a grain of sand, how much sand would it take to represent all the stars in the universe?
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more than all the beaches on Earth
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How long would it take to count all the stars in the Milky Way Galaxy at a rate of one per second?
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3000 years
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What is our Cosmic Address?
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Earth-Solar System-Milky Way-Local Group-Local Supercluster-Universe
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(True or False) Our solar system contains only one star
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True
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(True or False) We live in the solar system, which is a part of the Milky Way Galaxy
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True
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(True or False) The Andromeda Galaxy is the nearest galaxy to us
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True
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(True or False) It would take about 60 billion years to reach the Andromeda Galaxy with current technology
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True
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distance to Alpha Centauri A from Earth
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4.4 light years
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distance from Pluto to sun
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5900 km
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size of the universe
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12 billion light years
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distance to Andromeda galaxy
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2.5 million light years
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size of the solar system
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12 billion km
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the sum total of all matter and energy
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universe
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the sun, the planets and their moons, asteroids, comets, and space trash
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solar system
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a group of 30 or so galaxies
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Local Group
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a huge disk shaped collection of stars in space
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Milky Way
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a tightly grouped association of galaxies
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Local Supercluster
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What is the nearest star system?
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Alpha Centauri A
