Fill in the blank: The center of an object is called the ________.

Fill in the blank: A hole in the ground caused by the impact of an object from space is called a ________.

Fill in the blank: The force that pulls all objects toward each other is called ________.

Fill in the blank: A huge ball of rock that travels around a planet; a natural satellite is called a ________.

Fill in the blank: To revolve around another object is to ________.

Fill in the blank: A very large object that orbits a star is called a ________.

Fill in the blank: A natural or human-made object that orbits Earth or another object in space is called a ________.

Fill in the blank: A body in outer space, made of hot gases, that shines in the night sky is called a ________.

Fill in the blank: Like Earth; describes planets that are rocky and Earthlike in size are called ________ planets.

Fill in the blank: The area in space between Mars and Jupiter where most asteroids orbit is called the ________ belt.

Fill in the blank: The distance between the sun and earth, approximately 150 million kilometers, is called an ________.

Fill in the blank: A layer of gases surrounding a planet, star, or moon is called the ________.

Fill in the blank: The measure of the amount of matter in an object is called ________.

Hydrogen and Helium make up the _______.

Which planets are the gas giants?

A nearly round object that orbits a star, is smaller than a planet, and is not a satellite of another object is a: