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12 Cards in this Set
- Front
- Back
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Why do stars near the horizon seem to flash and change color?
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The twinkling and flashing effects are due to the Earth's atmosphere. Turbulent air currents cause the stars' light to "dance around."
(Pg 4) |
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Define: Seeing
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The steadiness of the atmosphere.
Steady are means good seeing. Page 4 |
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Define: Stars
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Spheres of gas similar to our own Sun, emitting their own heat and light.
Page 4 |
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What detirmines the color of a star?
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Temperature
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Define: Planet
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Cold bodies that shine by reflecting the Sun's light. They are constantly on the move as they orbit the Sun.
Page 4 |
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Name four planets that can be seen with the naked eye
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Venus, Mars, Jupiter, and Saturn
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Name the brightest planet in Earth's sky
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Venus
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How many stars are visible to the naked eye on a clear night?
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About 2000
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Define: Constellations
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88 sections of the night sky,which astronomers as a convenient way of locating and naming celestial objects.
Page 4 |
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Who devised the main constellations?
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Middle Eastern peoples who fancied that they could see a likeness to certain fabled creatures and mythological heros among the stars.
Page 4 |
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What constellations are were of importance in ancient times?
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12 constellations of the zodiac
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Our madern constellations derive from a catalogue of _________ compiled by Greek astronomyer _______ in AD _____
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48, Ptolemy, 150
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