5th Grade Solar System

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Vocabulary definitions & terms for 5th grade solar system unit

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

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