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Cards In This Set
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Aristotle claimed the earth was ________, but that the heavens were _______.
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Imperfect, perfect
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What is one AU?
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The distance from the earth to the sun (approximately 150 million km)
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What is one light year?
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The distance light travels in one year
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What is today's definition of a constellation?
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Well defined regions of the night sky
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The Big Dipper is an example of a(n) _________.
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Asterism (portion of a constellation)
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What is the Celestial Sphere?
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The appearance of the the stars from earth.
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The ______ star is the brightest star in a constellation.
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Alpha
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The brightest stars are part of the ________ magnitude, and the the faintest stars visible to the naked eye are part of the _______ magnitude.
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First, sixth
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First magnitude stars are _______ times brighter than sixth magnitude stars.
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One hundred
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Stars become _______ times brighter with each increase in magnitude.
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2.5
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What is the relationship between magnitude and brightness of a star?
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The smaller the magnitude, the brighter the star.
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What is a zenith?
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The highest point in the celestial sphere
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What is a nadir?
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The lowest point in the celestial sphere
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What is the celestial equator?
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Earth's equator projected out into space
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What is the celestial north pole?
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Earth's north pole projected out into space
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