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Ch 6 Earth and Space
Definitions from Earth and Space Science BJU Press Ch 6
| Term | Definition |
|---|---|
| minor planet | Minor planets and asteriods are the same thing. |
| asteriod | also known as minor planets, look more like stars than planets called asteroids, meaning starlike |
| comet | a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun. |
| head | One of the two main parts of a comet. front part of a comet |
| tail | 2nd main part of a comet, "tail" end |
| nucleus | the very middle of a comet. often made out of rock dust and ice |
| coma | the outside of the head of a comet |
| ices | frozen material in a comet |
| type I tail | a tail of a comet that forms quickly and is mainly gas pushed away from the sun by solar winds. more straight |
| type II tail | a tail of a comet that forms more slowly and is made mainly of dust that is pushed away from the sun by the pressure of sunlight. more floppy |
| periodic comet | a comet that keeps returning and has an elliptical orbit |
| Kuiper belt | a donut-shaped region of space beyond the orbit or Uranus, short period comets come from here |
| meteoroid | a particle of rock or dust in space that orbits the sun |
| meteor | When a meteoroid enter the earths atmosphere and begins to glow |
| fireball | an extra spectacular meteor |
| bolide | an exploding fireball |
| train | a lighted trail left by a meteor |
| meteorite | meteoroids that land on the earth |
| sporadic meteor | random meteors |
| shower meteors | a number of meteors that appear to radiate from one point in the sky at a particular date each year, due to the earth's regularly passing through a field of particles at that position in its orbit. Meteor showers are named after the constellation in whic |
| perseids | Aug. 12 shower meteor |
| Leonids | Nov. 17 shower meteor |
| stones ( stony meteorites) | Meteorites composed of mainly stones |
| irons | Meteorites composed mainly of irons |
| stony irons | Meteorites composed or iron and stones |
| chondrule | a spheroidal mineral grain present in large numbers in some stony meteorites |
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