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Unit 8

Solar System and Exploration

TermDefinition
Gravity force of attraction between two objects due to their masses
Model a picture, idea, or object that represents an object, a system, or a process and is used to help with understanding; models have advantages and limitations
Orbit the path that one object in space follows as it revolves around another object in space
Asteroid a small rocky body orbiting the sun.
Comet a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
Cosmonaut a Russian astronaut.
Galilean Moons the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto.
Gas Giant Planets Jupiter, Saturn, Uranus and Neptune.
International Space Station a large spacecraft that orbits around Earth. It is a home and science lab for astronauts.
Meteor a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
Revolution the movement of one object around a center or another object.
Rotation a circular movement of an object around a center (or point).
Satellite an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
Space Probe an unmanned exploratory spacecraft designed to transmit information about its environment.
Space Shuttle a rocket-launched spacecraft, able to land like an unpowered aircraft, used to make repeated journeys between the earth and earth orbit.
Terrestrial Planets the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars.
Ellipse a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant.
Created by: Turnerr