Unit One Vocab

Front

Definition of asteroid

Back

A piece of rock or metal made of material similar to that which formed the planets.

Front

The Big Bang Theory is

Back

A theory that the universe began ~13.7 billion years ago with a huge explosion.

Front

Earth-like planets with hard surfaces made of rocks or metals are called

Back

Terrestrial Planets

Front

The entirety of space, including all stars, planets, and matter, is called the

Back

Universe

Front

The Scientific Theory is

Back

Explanation supported by results from repeated testing.

Front

A person who studies outer space and objects beyond Earth’s atmosphere is called

Back

An astronomer

Front

Natural objects outside Earth’s atmosphere like the Moon or Sun are called

Back

Celestial Objects

Front

The solar system consists of eight planets, including Earth, and other objects that revolve around the sun.

Back

A system of eight planets, including Earth, and other objects that revolve around the sun.

Front

Astronomy studies:

Back

Outer Space

Front

An ellipse is

Back

An elongated, closed curve describing Earth's orbit around the Sun.