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25 Cards in this Set
- Front
- Back
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Concluded that Earth is round because it casts a curved shadow on the moon during a lunar eclipse |
Aristotle |
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1st person to propose the heliocentric theory, even though people still thought Earth was at the center of the universe |
Astarchus |
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Still believed the geocentric theory, and devised an elaborate model to explain the retrograde motion |
Ptolemy |
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The apparent backwards motion of a planet |
Retrograde |
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Earth is one of the 6 planets, it rotates like they do. The sun is at the center of the solar system. |
Nicholas Copernicus |
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Discovered 3 laws of planetary motion. 1. The shape of a planet’s orbit is an eclipse (oval) not a circle 2. Planets travel faster when they are closer to the sun. 3. T2=d3 Mass takes 188 years to orbit, and is 152 AU from the sun. |
Johannes Kepler |
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Made discoveries that supported Copernicus 1. Discovered 4 moons of Jupiter 2. Saw that Venus has phases |
Galileo Galilei |
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Planets are held in orbit by a combination of gravity and inertia |
Isaac Newton |
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First man into space, 1961 |
Yuri Gagarin (USSR) |
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First man to walk on the moon |
Neil Armstrong (USA, 1969, Apollo 11) |
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Visited all 4 outer planets (Jupiter, Saturn, Uranus, Neptune) |
The Voyager Mission (USA) |
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Optical telescopes use ... |
Visible light |
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Refracting optical telescopes use lenses to ... |
bend the light |
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Reflecting optical telescopes use a ... |
concave mirror |
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Radio telescopes use radio waves ... |
which are longer waves than visible light |
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The Hubble Space Telescope (HST) uses ... |
visible light |
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According to the nebular theory, the solar system formed from a ... |
rotating cloud of gas and dust |
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Geocentric model said that the ... and ... revolved around Earth |
sun, other planets, Earth |
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Who was Copernicus? What did he propose? |
Copernicus proposed Earth is a planet that orbits the Sun. |
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What is the shape of the planets’ orbits? |
Each planet resolved that an line connecting it to the sun sweeps over equal. |
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What is at the center of the heliocentric model? |
The sun |
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Which two telescopes use visible lights? |
Refracting and reflecting telescopes |
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What gas composes the vast majority of the sun? |
Hydrogen |
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In the fusion process what is formed when Hydrogen combines? |
Helium |
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Identify the two types of optical telescopes |
Refracting and reflecting telescopes |
