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25 terms

Astronomy Ch 3 The Solar System

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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