An imaginary line through the middle of an object, around which that object spins

To keep turning in a circle or orbit around a central point or object

The invisible path followed by an object circling a planet, the sun, or another star.

An orbit that follows a path that resembles a squashed circle.

This word means incoming solar radiation, or the amount of the sun’s energy that reaches Earth

Earth’s tilt on its axis affects the amount of ____________ that reaches different latitudes.

Any natural body that revolves around a planet

A darkening of the moon by its entering the shadow of the earth

A complete of partial hiding of the sun caused by the moon’s passing behind the sun and the earth

The mixture of gasses that surrounds a planet

A large body in space that does not give off light

An object made up of dust and gas in space that travels around the sun, and sometimes forms a long, bright tail

A bright streak of flash of light in the sky which occurs when small pieces of space material enter our atmosphere and burn up, often called a shooting star

Any star that is at the center of a system of planets

A ball of burning gasses in space that gives off light

The sun and the bodies that move in orbit around it

A very large group of stars and planets

The galaxy that includes Earth and our solar system. This galaxy is made up of 100 billion stars

A space empty of all matter

Everything that exists in space

Which of the following is NOT a criteria for a space object to be considered a planet?