Astronomy Ch 3 The Solar System

25 terms by jvaught 

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heliocentric

earth and the planets revolve around the SUN

geocentric

earth is the center of the revolving planets and stars

ellipse

an oval shape , which may be elongated or nearly circular

core

central region of the SUN

nuclear fusion

hydrogen atoms join to form helium

radiation zone

a region of very tightly packed gas where energy is transferred mainly in the form of electronic radiation

convection zone

the outer most layer of the SUNs interior

photosphere

inner layer of the SUNs atmosphere

chromosphere

middle layer of the SUNs atmosphere

corona

the outer layer of the SUN

solar wind

streams of electrically charged particles

sunspot

areas of gas on the suns surface that are coller then the gases around them

prominence

A loop of gas that protrudes from the sun's surface, linking parts of sunspot regions

solar flare

gas eruptions into space

terrestrial planets

the four inner planets

greenhouse effect

The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space

gas giant

4 outer planets

ring

thin disc or small particles of ice and rock

comet

loose collections of ice , dust, and small rocky particles whose orbits are usually very long, narrow ellipses

asteroid

too small rocky objects too small and too numerous to be considered full fledged planets

meteoroid

a chunk of rock or dust in space

meteor

(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

meteorite

a meteoroid that strikes the surface of a moon or planet

extraterrestrial life

life other than that on Earth.

Kuiper belt

a doughnut - shaped region that extend beyond NEPTUNES orbit about 100 times Earth's distance from the SUN

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