The Earth rotates, or spins around on its axis, once every

Earth's day/night cycle is caused by Earth's

A ______________________________ is made up of a star and the planets and other space objects that revolve around it.

A large, round body that revolves around a star is called

Objects made of rock and iron that orbit the sun in a wide region between Mars and Jupiter are called ____________________.

A(n) ______________________________ is a chunk of frozen gases, rock, ice and dust.

Pieces of rock that break off of asteroids and travel through space are called ______________________.

The study of the objects in space and their properties is known as _________________________________.

_________________________________ are balls of hot, glowing gases.

Everything that exists--planets, stars, dust, and gases--make up the _________________________________.

A group of billions of stars and objects that orbit the stars (gas and dust) is known as a ___________________.

The characteristic of a star that is related to its temperature is its _______________________________.