Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
C h 27- planets
| Question | Answer |
|---|---|
| solar system | the sun and all of the other bodies that orbit around it |
| planet | any of the primary bodies that orbit a star |
| solar nebula | a rotating cloud of gas and dust from which the sun and planets formed |
| planetesimal | a small body from which a planet orginated |
| differentiation | process during planet formation when denser materials sink to the center |
| outgassing | process of volcanic eruptions releasing water vapor and other gases |
| ozone | a molecule with three atoms of oxygen which shield us from ultraviolet radiation |
| geocentric | model of the solar system, proposed by Aristotle and Ptolemy, where the Earth is at the center |
| heliocentric | model of the solar system, proposed by Copernicus, where the Sun is at the center |
| retrograde motion | the apparent backward motion of closer objects compared to background objects |
| eccentricity | the degree of elongation of an elliptical orbit |
| ellipse | a closed curve with two focal points, where the distance from one focus to the curve to the other focus remains constant |
| law of ellipses | each planet orbits the sun in an elliptical path |
| law of equal areas | a planet sweeps out equal areas in equal amounts of time in its orbit |
| law of periods | the cube of a planets average distance from the sun is proportional to the square of its orbital period |
| orbital period | time required for a body to complete an orbit |
| inertia | the tendency of an object at rest to remain at rest, or if moving to resist a change in speed or direction |
| terrestrial planets | one of the dense planets nearest to the sun: "earthlike"; Mercury, Venus, Earth, and Mars |
| greenhouse effect | the trapping of energy in the atmosphere by water vapor and carbon dioxide |
| gas giant | a planet that has a massive atmosphere; "Jovian" or Jupiter-like; Jupiter, Saturn, Uranus, and Neptune |
| Kupier belt | region of the solar system just beyond the orbit of Neptune |
Created by:
sisteele
Popular Earth Science sets