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12 Cards in this Set

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Why do stars near the horizon seem to flash and change color?
The twinkling and flashing effects are due to the Earth's atmosphere. Turbulent air currents cause the stars' light to "dance around."


(Pg 4)
Define: Seeing
The steadiness of the atmosphere.

Steady are means good seeing.

Page 4
Define: Stars
Spheres of gas similar to our own Sun, emitting their own heat and light.

Page 4
What detirmines the color of a star?
Temperature
Define: Planet
Cold bodies that shine by reflecting the Sun's light. They are constantly on the move as they orbit the Sun.

Page 4
Name four planets that can be seen with the naked eye
Venus, Mars, Jupiter, and Saturn
Name the brightest planet in Earth's sky
Venus
How many stars are visible to the naked eye on a clear night?
About 2000
Define: Constellations
88 sections of the night sky,which astronomers as a convenient way of locating and naming celestial objects.

Page 4
Who devised the main constellations?
Middle Eastern peoples who fancied that they could see a likeness to certain fabled creatures and mythological heros among the stars.

Page 4
What constellations are were of importance in ancient times?
12 constellations of the zodiac
Our madern constellations derive from a catalogue of _________ compiled by Greek astronomyer _______ in AD _____
48, Ptolemy, 150