chapter 1 mastering astronomy answers – Flashcards
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Which of the following has your "cosmic address" in the correct order?
answer
you, earth, solar system, milky way, local group, local supercluster, universe
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Which of the following statements best describes what astronomers mean when they say that the universe is expanding?
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The average distance between galaxies is increasing with time. (edwin hubble discovered this)
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stuff about our universe regarding 'raisin size' 'universe bounds' 'distance between raisins'
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An observer at any raisin sees more distant raisins moving away faster, just as an observer in any galaxy sees more distant galaxies moving away faster.
The raisins stay roughly the same size as the cake expands, just as galaxies stay roughly the same size as the universe expands.
The average distance increases with time both between raisins in the cake and between galaxies in the universe.
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what two properties of distant galaxies do astronomers have to measure to show that we live in an expanding universe?
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distances and speeds
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1 light-second in kilometers is equal to what in km
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3.00 x 10^5 km
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1 light second in miles is equal to what in km
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1.86×10^5
mi
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1 light minute in km
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1.80×10^7
km
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1 light minute in miles
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1.12 x 10^7
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1light hour in km
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1.08×109
km
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1 light hour in miles
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6.72×108
mi
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1 light-day in kilometers
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2.59 x 10^10
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1 light day in miles
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1.61 x 10^10
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rank objects from largest to smallest in diameter starting with the universe
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universe, local supercluster, local group, milkway, solar system, sun, jupiter, earth, me
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rank objects from longest distance to smallest distance
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distance from MW to andromeda galaxy, distance from sun to center of mw galaxy, the distance from earth to alpha centauri, 1 LY, distance across our Solar system to neptune, 1 AU and distance from earth to sun SAME
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Rank the objects based on their distances from Earth, from farthest to nearest
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star on far side of AD galaxy, star on near side of AD galaxy, star on far side of mw galaxy, star near center of mw galaxy, orion nebula, Alpha centauri, pluto, sun
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Suppose each object emitted a burst of light right now. Rank the objects from left to right based on the amount of time it would take this light to reach Earth, from longest time to shortest time.
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same as the ranking of distances
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rank the objects from left to right based on how much they have aged since they emitted the light we see today, from greatest to least.
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same as the rankings above
