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Dr. Crazy likes to study..
Planetry nebulie
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Historical order of 5 dead white dudes
- 1. Copernicus
- 2. Brahe
- 3. Kepler
- 4. Galileo
- 5. Newton
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First sun centered model of the solar system or universe was by
Copernicus
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Best naked-eye astronomer was
Brahe
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What is parallax?
view an object from 2 different locations and measure it's distance, used by brahe
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Discusses planetary motions, 3 laws of ellipses of planets was by
Kepler
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What are the 3 laws of ellipses?
- 1. Sun is the focus of a planet's ellipse
- 2. Closer to sun, faster; farther from sun, slower
- 3. Smaller ellipses have shorter periods, bigger ellipses have longer orbital periods.
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First observation of the sun
Galileo
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2 laws we need to know of Gravity?
- 1. object will stay in motion and a straight line unless acted upon by an outside force.
- 2. F= ma
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What would happen to a planet's orbital speed if its mass were to be doubled but the distance stayed the same?
It would orbit at the same speed
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When a planet is twice as far away from its star, how does the gravitational force change between them?
The force will be 1/4 as strong
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When a planet becomes 3 times as massive, but the orbit is the same, How does the gravitational force change between the planet and the star?
The force will be 3x as strong
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What are Epicycles?
When Greeks added a second circle to the geocentric model.
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Keplers 3 laws
- 1. orbit of a planet around the sun is an ellipse
- 2. There are equal areas and times of interval when a planet goes around the sun
- 3. size of orbit determines orbital period.
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What can be learn by analyzing starlight?
- 1. A star's temp from its blackbody curve
- 2. What atoms are present, from absorption lines in the spectrum.
- 3. A star's motion
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