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.

a small body of matter from outer space that enters the earth’s atmosphere, burning as a result of friction and appearing as a streak of light.

A small rocky body orbiting the sun. A large number can be found in a belt between the orbits of Mars and Jupiter.

All existing matter and space considered as a whole.

The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

A system of billions of stars, gas, and dust, held together by gravitational attraction.

The appearance of the lit part of the Moon as seen by an observer on Earth.

This happens when the moon's shadow falls on Earth blocking out the sun's light.

This happens when Earth's shadow falls on the moon blocking the moon's light.

The spiral galaxy in which our solar system is located.

The theory that the universe exploded from a single point, and has been expanding ever since.

The force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Ptolemy's model of the universe with Earth at the center of the Sun, Moon, stars, and planets.

Copernicus' model in which the Earth and planets revolve around the Sun at the center of the Solar System.

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Solar System

Space Science

Term	Definition
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.
meteor	a small body of matter from outer space that enters the earth’s atmosphere, burning as a result of friction and appearing as a streak of light.
asteroid	A small rocky body orbiting the sun. A large number can be found in a belt between the orbits of Mars and Jupiter.
universe	All existing matter and space considered as a whole.
solar system	The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
galaxy	A system of billions of stars, gas, and dust, held together by gravitational attraction.
moon phases	The appearance of the lit part of the Moon as seen by an observer on Earth.
Solar eclipse	This happens when the moon's shadow falls on Earth blocking out the sun's light.
Lunar eclipse	This happens when Earth's shadow falls on the moon blocking the moon's light.
The Milky Way Galaxy	The spiral galaxy in which our solar system is located.
The Big Bang Theory	The theory that the universe exploded from a single point, and has been expanding ever since.
gravity	The force that attracts a body toward the center of the earth, or toward any other physical body having mass.
Geocentric Model	Ptolemy's model of the universe with Earth at the center of the Sun, Moon, stars, and planets.
Heliocentric Model	Copernicus' model in which the Earth and planets revolve around the Sun at the center of the Solar System.

Created by: lcrowe

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