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Universe Vocabulary

Across
Small pieces that break off comets or asteroids that fall to Earth
Type of galaxy where the "arms" spiral out from the center
Distance between two or more objects.
Small objects made of ice and dust that orbit the Sun.
Characteristics and composition of a planet’s atmosphere.
The universal force of attraction acting between all matter.
The natural satellite of the Earth, visible by reflected light from the sun.
The spiral galaxy in which our solar system is located
How large something is compared to another object.
A fixed luminous point in the night sky which is a large, remote incandescent body like the sun
Down
Any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the center of it all.
A theory in astronomy that states that the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density.
The star around which the Earth orbits.
Small, rocky objects that orbit the Sun and are smaller than planets.
The whole of space...all forms of energy and matter.
Third planet from the sun. We live on this planet.
A cosmological model in which the Sun is assumed to lie at or near the central point while the Earth and other bodies revolve around it.
An idea used to account for a situation or justify a course of action.
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.
Landforms and bodies of water that covers the surface of a planet
A celestial body moving in an elliptical orbit around a star.
A collection of stars and interstellar material held together by gravity.
The resistance of an object to any change in its motion, including a change in direction.