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30 Cards in this Set
- Front
- Back
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What does our Galaxy look like? |
Its a spiral shape with a dense core and swirling arms rotating! |
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AU |
Astronomial Unit. The distance between the Earth andnSun |
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How many KM in an AU? |
150 Million Km |
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What is AU Used for measuring? |
Small distances in astronomy that are still massive |
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Lightyear |
The distance light will travel in 1 year |
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How many KM is in 1 LY? |
9,500,000,000,000 km |
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What are lightyears used for measuring? |
Large amounts of space and distance that requires a larger unit |
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Celestial Sphere |
The sphere in which we can see the night sky |
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What does the celeste sphere contain? |
Stars, planets, constellations, and any other viewable space we can see from earth’s atmosphere |
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How does the celestial sphere move, and what does it move around? |
It rotates around the celestial poles, at the south and north poles of the earth. As it rotates, the stars move across out night sky |
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7 Wanderers in the Celestial Sphere |
The Sun, Moon, Mercury, Venus, Jupiter, Mars, and Saturn |
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The Zodiac |
A band of the sky where the Moon, Sun, and Planets move through (18 degrees wide) |
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The Ecliptic |
The path the sun takes through the celestial sphere |
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Declination |
Lattitude, 0-90 degres above the horizon |
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Right acension |
Longitude, hrs + mins |
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Ptolemy |
Astronomer who first described a geocentric model |
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Geocentrism |
That everything revolves around the earth |
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Heliocentrism |
That everything revolves around the sun |
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What evidence suggests we DO live in a geocentric system? |
Motion of the celestial sphere, everything moving around us |
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Issues with geocentrism? |
Retrograde motion of the zodiac planets |
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What did Ptolemy come up with to explain retrograde motion? |
Epicycles |
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Who first described a heliocentric system? |
Islamic Astronomers Copernicus |
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Galileo |
Astronomer who first found evidence of a heliocentric system |
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What observations from Galileo prove we are in a heliocentric system? |
The moons of Jupiter And the Phases of Venus |
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Tycho Brahe |
Provided valuable and consistent data of the stars and planets |
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Johannes Kepler |
Created Kepler’s Laws of Planetary Motion |
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Issac Newton |
Created the Laws of Motion |
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Keplers first law |
All objects have eliptical orbits |
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Keplers second law |
Planets cover equal areas in equal amounts of time |
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Kepler’s Third Law |
As distance from the star increases, period of revolution also increases
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