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Astronomy Review

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2.a rare event involving the explosion of a star
5.a cool giant star
7.developed the geocentric model of the solar system
9.a complete cycle of the ____ takes about 29.5 days
10.night and day are caused by this movement of the earth
11.a vehicle that is intended to carry humans into space
12.stars are composed of ____ and helium gases
13.different hemispheres have _____ seasons
16.theory that the universe began with all matter and energy concentrated in a very small object
19.type of galaxy with little dust and gas
21.the sudden brightening of a white dwarf
22.consists of all matter, energy and space
23.spacecraft that carries instuments to explore space
27.theory that states the universe is undergoing cycles of expansion and contraction
32.distance light travels in one year
33.the study of the universe
34.phases of the moon are caused by this
35.occurs when the moon passes into the shadow of the earth
36.an expanding shell of gas; stellar nursery
37.occurs when the moons shadow falls on the earth
1.explained how gravity keeps the planets in order
2.an object launched into orbit; could be used with GPS
3.model of the solar system that we accept today (sun centered)
4.this diagram is used to classify stars
6.the model of the solar system that said it is earth centered
8.theory that states there never was a beginning and there will not be an end to the universe
14.the final stage of a white dwarf
15.type of galaxy we live in
17.our seasons are caused by this movement of the earth
18.developed the heliocentric model of the solar system
20.when it is summer in the southern hemisphere, it is ____ in the northern hemisphere
24.large groups of stars clustered together
25.developed the 3 models of planetary motion
26.a dying star that is slowly cooling off
28.the sun gets its energy through this process
29.Hubble announced that the universe was doing this
30.name of the galaxy we live in
31.tool used for observing the sky

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