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18 Cards in this Set

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GEOCENTRIC
Ptolomey's theory that all the planets revolve around Earth
HELIOCENTRIC
earth and the other planets revolve around the sun
heliocentric
theory that all the planets revolve around the sun
ellipse
elongated circle or oval shape that all the planets orbit in
inertia
tendency for a moving object to continue in a straight line or a stationary object to remain still
photosphere
inner layer of the sun that makes light
chromosphere
middle layer where a red glow can be seen during a total eclipse
corona
outer layer only visible during eclipses
solar wind
a stream of electrically charged particles
sunspots
areas of gas on the sun that are cooler than the areas around them
prominences
reddish loops of gas that link sunspot regions
solar flares
explosions of hydrogen gas
comet
chunks of ice and dust whose orbits are usually very long narrow ellipses
asteroids
an object that revolves around the sun but is to small to be considered a planet
meteoroid
A chunk of ice or rock in space
meteor
a meteorioid that has entered earth's atmosphere
meteorites
meteorites that hit earths surface
extraterrestrial life
life other than that on earth