| Definition | Term |
|---|
| small planetlike bodies, orbit lies between Mars and Jupiter | |
| region between Mars and Jupiter where most asteroids orbit | |
| the fuzzy, gaseous somponent of a comet's head | |
| a small body that generally revolves around the Sun in an elongated orbit | |
| describes the eruption of magmas derived from the partial melting of ice | |
| celestial bodies that orbit stars, massive enough to be spherical but have not cleared their neighboring regions of planetesimals | |
| the speed required to escape a planet's gravity | |
| depressions taht are the result of collisions with bodies such as asteroids and comets | |
| Planet group containing Jupiter, Saturn, Uranus, and Neptune | |
| region that hosts comets in the outer solar system | |
| areas of the moon elevated several thousand kilometers | |
| the soil-like layer on the moon | |
| dark regions on the moon | |
| | Definition | Term |
|---|
| a meteoroid that enters Earth's atmosphere | |
| a swarm of meteoroids traveling in the same direction | |
| the remains of meteoroids found on Earth | |
| small solid particles that have orbits in the solar system | |
| states that the Sun and planets formed from a solar nebula | |
| the small central body of a comet | |
| a shperical shell composed of comets that orbit the Sun | |
| a solid celestial body; aggregated into increasingly larger bodies, ultimately forming the planets | |
| a developing planetary body that grows by the accumulation of planetesimals | |
| group of non-planet objects containing asteroids, comets, and meteoroids | |
| a rotating cloud of interstellar gases and dust | |
| light-colored regions on the moon | |
| planet group containing Mercury, Venus, Earth, and mars | |
|
The Nine Planets 
Digits of Pi 
Multiplication Table
