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
Our Solar System
| Definition | |
|---|---|
| solar system | The Sun together with the group of celestial bodies that are held together by its attraction and revolve around it. |
| planet | an object that orbits a star , is large enough to be nearly spherical in shape, and has no other object in its orbital path |
| orbit | the path an object follows as it moves around another object |
| ellipse | a stretched-out-circle |
| eccentricity | the measure of how far an object's orbit is from being circular |
| gravity | an attractive force that exist between all objects that have mass |
| momentum | a measure of how hard it is to stop a moving object |
| inertia | the tendency for objects in motion to resist changes to their direction and speed |
| period of revolution | the time it takes an object to travel once around the Sun |
| period of rotation | the time it takes an object to complete one rotation |
| astronomical unit | the average distance from Earth to the Sun |
| Sun | the star in the center of our solar system around which the planets revolve and receive light |
| dwarf planet | an object that orbits a star and is nearly spherical in shape but shares its orbital path with other objects of similar size but also isn't classified as a satellite |
| moon | a natural satellite of a planet |
| meteor | a meteoroid that has entered Earth's atmosphere and produces a streak of light |
| asteroid | a small, rocky object that orbits the Sun |
| comet | a small, rocky, icy object that orbits the Sun |
| Kuiper Belt | a band of small celestial bodies beyond the orbit of Neptune |
| Oort Cloud | a spherical shell of celestial bodies believed to surround the Sun far beyond he orbits of the outermost planets |
| astrobiology | the study of the origin development, distribution, and future of life in the Universe |
| habitable zone | the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets |
| extremophile | an organism that lives under extreme environmental conditions |
| greenhouse effect | The natural process that occurs when certain gases in the atmosphere absorb and reradiate thermal energy from the Sun |
| exoplanet | any planet outside our solar system |
Created by:
pharristx
Popular Science sets