Front

What is an axis?

Back

An imaginary line an object turns or spins on.

Front

What season is it in the Northern Hemisphere when it is tilted toward the Sun on June 21st?

Back

Summer.

Front

What does the luminosity of a star describe?

Back

Its brightness.

Front

Which two gases are stars mostly made of?

Back

Hydrogen and Helium.

Front

What causes night and day?

Back

Earth's rotation.

Front

What is a constellation?

Back

A group of stars forming a recognizable pattern.

Front

What is the difference between rotation and revolution?

Back

Rotation is the spinning of an object on its axis, while revolution is the movement of an object around another object.

Front

What is the significance of the North Star?

Back

It is a star that is located nearly directly above the North Pole and is used for navigation.

Front

What is a light year?

Back

The distance that light travels in one year.

Front

What is the main source of energy for stars?

Back

Nuclear fusion, primarily converting hydrogen into helium.