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Astronomy ch.14 Crossword
Down
:
1) the most common type of telescope
3) a telescope thar uses a set of lenses to gather and focus light from distant objects
5) showed that all objects in the universe attract each othe through gravitational force
6) the time required for earth to rotate once on its axis
7) the earth is the center at the universe
8) one of the first people to use a telescope to observe obujects in space
11) the point in the sky directly above the observer on earth
13) the angle between an object in the sky and the horizon
17) the sun is at the center of the universe
Across
:
2) annouceed that all of the planets revolve around the sun in elliptical orbits and that the sun is not in the exact center of the universe
4) proved that other galaxies existed beyond the edge of the Milky Way
9) study of the universe
10) time reqiured for the earth to orbit once around the sun
12) a region of sky that contains a recognizable star pattern and that is used to describethe location of objects in space
14) a division of the year that is based on the orbit of the moon around earth
15) the distance that light travekls in one year; about 9.46 trillion kilometers
16) the line where the sky and the earth appear to meet
18) an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
19) all of the frequencies or wavelenghts of electromagnetic radiation
20) a telescope that uses a curved mirror to gather and focus light frim distant objects
21) used large tools to make the most detailed astronomical observations
22) detect radio waves
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