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19 terms

5th Grade Solar System

Vocabulary definitions & terms for 5th grade solar system unit
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Solar System
the Sun and the planets and other objects that orbit the Sun
Planet
a large body in space that orbits a star and does not produce light on its own
Orbit
a path of an object as it circles around another object in outer space
Sun Energy
heat and light that radiates through space to Earth
Planetary Orbits
the near circular path of the planets around the Sun
Gravitational Attraction
a natural force that pulls two objects toward one another
Fusion
the joining together of the nuclei of two different atoms resulting in the formation of new atom and the release of energy
Moon
a natural object that revolves around a planet
Earth
the only planet in the solar system on which life is known to exist
Satellite
a natural or human built object that revolves around another object in space
Asteroid
a rocky object that orbits the Sun, found mostly in the region between Mars and Jupiter
Comet
a small object in space which orbits a star and is made of a rocky core surrounded by ice, dust particles, and frozen gases
Sun
the star that is made of mainly hydrogen and helium gases, and supplies the heat and light that sustains life on Earth
Meteor
a piece of rock or metal from space that enters Earth's atmosphere
Elliptical Orbit
a flattened,circular shaped path that revolves around an object
Circular Orbit
a circular path that revolves or goes around an object
Gravity
an invisible force that pulls objects toward each other
Force
something that causes an object to move, change its shape, speed or direction
Revolution
the movement of an object around another object or point