Term
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Definition
Sun
8 Planets
Satellites of planets
asteroids, comets, etc. |
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Definition
"sea" of stars closest to the sun within a few 100 ly
several 10's of thousands of stars
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Definition
Huge system of billions of stars
Ours is Milky Way
Shape= flat with a central bulge |
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Definition
flattened system with several billion stars
diameter of 100,000 ly |
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Term
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Definition
Group of 40 galaxies
Ours has:
Large and Small Magellic clouds
Andromeda Galaxies
Many other dwarf galaxies
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Term
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Definition
A group of about 10 galaxies including:
Local Group
The Virgo Cluster |
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Term
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Definition
| An immense (and probably infinite) "sea" of galaxy clusters and super clusters |
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Term
| Where are we in the Universe |
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Definition
Earth
Solar System
Solar Neighborhood
Galaxy
Local Group
Local Supercluster
Universe |
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Term
| Why does the sky rotate a period of hours? |
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Definition
| Rotation of Earth about its axis |
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Term
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Definition
| an imaginary spinning sphere, much larger than earth, with Earth at center. All sky objects lie inside surface |
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Definition
| Maintain fixed patterns among themselves, define constelaations |
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Term
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Definition
| move slowly relative to fixed stars |
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Term
The sun is seen in the constellation libra in October and in Scorpio in November. Why the change?
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Definition
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Term
| The path in the sky the Sun appears to trace out during a year is called the.. |
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Definition
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Term
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Definition
sun moves westward across the sky (reflect earths spin)
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Term
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Definition
| sun moves eastward relative to constellations |
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Term
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Definition
Phases of the moon are NOT caused by the Earth’s shadow
Only lunar eclipses are cause by the Earth’s shadow
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Term
What characteristics of the Earth are demonstrated by the change on position of the NCP as a traveler moves North or South?
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Definition
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Term
What astronomical phenomena is cause by the shadow of the earth?
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Definition
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Term
What motion of the Earth has cause a change over time in the dates of the year assigned to various constellations of the Zodiac?
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Definition
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Term
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Definition
| Backwards motion (towards west) |
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Term
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Definition
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Mars moves on a small circle (epicycle) while moving around a bigger circle (deterrent)
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Term
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Definition
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Term
According to the Solar System model of Ptolemy, the nearest astronomical object the Earth is ..
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Definition
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Term
Which object in the Solar System never exhibits retrograde motion?
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Definition
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Term
According to the Solar System model of Ptolemy, which objects take exactly the same time to go around the Earth as the sun?
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