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The Solar System
Science Chapter 2
24
Astronomy
10/02/2007

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Term
heliocentric
Definition
a descrption of the solar system in which all of the planets revolve around the sun.
Term
heliocentric
Definition
a descrption of the solar system in which all of the planets revolve around the sun.
Term
ellipse
Definition
an elongated circle; or oval; the shape of the planets' orbit.
Term
inertia
Definition
the tendancy of a moving object to continue in a straight line or a stationary object to remain in place.
Term
nuclear fusion
Definition
the process by which hydrogen atoms join together to form helium, releasing energy.
Term
core
Definition
the central part of the sun, where nuclear fusion occurs.
Term
photosphere
Definition
The inner layer of the sun's atmosphere.
Term
chromosphere
Definition
The middle layer of the sun's atmosphere.
Term
corona
Definition
The outer layer of the sun's atmosphere.
Term
solar wind
Definition
a sream of electrically charged particles produced by the sun's corona.
Term
sunspot
Definition
areas of gas on the sun that are cooler than gases around them.
Term
prominence
Definition
A loop of gas that protrudes from the surface, linking parts of sunspot regions.
Term
solar flare
Definition
an explosion of hydrogen gas from the sun's surface that occurs when loops in sunspot regions suddenly connect.
Term
terrestrial planet
Definition
The name given to the four inner planets; Mercury, Venus, Earth, and Mars.
Term
retrograde rotation
Definition
The spinning motion of a planet from east to west oppisite the direction of rotations of most planets and their moons.
Term
greenhouse effect
Definition
the trapping of heat by a planet's atmosphere.
Term
gas giant
Definition
the name given to the firt four outer planets; Jupiter, Saturn, Uranus, and Neptune.
Term
comet
Definition
a ball of ice and dust whose orbit is a long, narrow eclipse.
Term
asteroid
Definition
objects revolving around the sun that are to small and to numerous to be considered planets.
Term
asteroid belt
Definition
the region of the solar system between the orbits of Mars and Jupiter, where many asteroids.
Term
meteoroid
Definition
a chunck of rock or dust in space.
Term
meteorite
Definition
a meteoroid that has hit earth's surface
Term
meteor
Definition
a streak of light in the sky produced by the burning of a meteoroid in earth's atmosphere.
Term
geocentric
Definition
a descrption of the solar system in which all of the planets revolve around the earth.