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Topic 3:Astron. C
Earth in the Universe, pgs. (48 - 50)
| Question | Answer |
|---|---|
| If you are asked a question about a planet in our solar system, what page and table must you reference? | Page 15, bottom, ESRT., Solar System Data |
| Can you list and describe the terrestrial planets? | Mercury, Venus, Earth & Mars. The inner four planets. They are small in diameter and high in density. |
| Can you list and describe the Jovian planets? | Jupiter, Saturn, Neptune & Uranus. The outer four planets. They are large in diameter and low in density. ( gas giants of hydrogen and helium ) |
| Which planet classification possesses the most moons? | Jovian. Mercury and Venus have no moons, and Earth only one. |
| Describe the relationship between period of revolution, and distance from the Sun of the planet or satellite. | Further away means greater period of revolution. |
| Can you compare the diameter of Jupiter, and the Sun, to that of Earth? | Jupiter is 10X, Sun is about 100X greater in diameter than Earth. |
| Are you able to define period of rotation? | Amount of time it takes for a planet to to make one spin around an imaginary axis, 360 degrees, or one planetary day. |
| What is an ellipse? | An oval shape revolutionary path with two (2) center points. One of the points is the Sun, the other is in outer space and is mathematically determined. |
| What are the foci? | The distance between the two center points of an ellipse. |
| Define the major axis. | The distance between the "tips of the football" of an elliptically shaped orbit. |
| Can you state the formula for determining planetary eccentricity? | E = Focal Distance / Length of the Major Axis ( *use a ruler ) |
| If the eccentricity value is close to zero, what will the orbital path look like? | Like a circle, as is suggested by the value of zero. |
| As a satellite gets closer to it's primary, what happens to kinetic energy? | Kinetic energy increases ( velocity increases ). |
| Compare aphelion and perihelion. | "A away, P is next to me." Aphelion is when Earth is furthest from the sun, July 4th; while perihelion is Earth closest to the Sun Jan. 3rd. |
| Define gravity: | The force of attraction between objects. |
| List the two factors that determine gravity. | 1) *Distance , 2) Mass . 1) *Closer = stronger, 2) More mass = stronger. |
| Why do some satellites have an atmosphere, while others do not? | Gravity is the key. Larger mass celestial objects like Earth have atmospheres, while low mass celestial objects like our moon have no atmosphere. |
| Define inertia: | A body at rest tends to remain at rest, a body in motion tends to remain in motion unless acted upon by an outside force. |
Created by:
whearn
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