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ch.16 vocab project

geocentric a model of the universe in which Earth is at the center of the revolving planets and stars
heliocentric a sun-centered model of the universe in which the sun is at the center of the revolving planets and stars
ellipse an oval shape, which may be alongated or nearly circular
moon a nutural satellite that revolves around a planet
core central region
nuclear fusion hydrogen atoms join together to form helium
radiation zone a region of very tightly packed gas where energy is transferred mainly in the form of electromagnetic radiation.
convection zone outer-most layer of the sun's interior
photosphere the inner layer of the sun's atmosphrere
chromosphere the middle layer of the sun's atmosphere
corona outer layer, which looks like a white halo around the sun
solar wind streams of electrically charged particles
sunspots areas of gas on the sun's surface that are cooler than gases around them
prominences huge, reddish loops of gas
solar flares heating of gas on the sun to millions of degrees celsius, causing the gas to erupt into space
terrestrial planets the four inner planets that are small, dense, and have rocky surfaces
greenhouse effect trapping of heat by the atmosphere
gas giants the four outer planets that are much larger and more massive than earth and do not have a solid surface
ring a thin disk of small particles of ice and rock
comet a "drty snowball" about the size of a mountain
coma clouds of gas and dust that form a fuzzy outer layer
nucleus the solid inner core of a comet
Kuiper Belt A donut-shaped region that extends beyond Neptune's orbit to about 100 times Earths distance from the sun
Oort Cloud a spherical region of comets that surrounds the solar system out to more than 1000 times the distance between pluto and the sun
Asteroids rocky objects revolving around the sun that are too small and numerous to be considered planets
Asteroid Belt the region of the solar system where most asteroids revolve around the sun between the orbits of Mars and Jupiter
Meteoroid a chunk of rock or dust in space
Meteor a streak of light in the sky produced by the burning of a meteoroid in Earths atmosphere
Meteorite Meteoroids that pass through the atmosphere and hit Earths surface
Extraterrestrial Life Life other than that on earth
Created by: 073231