Earth Science Unit 2 Lessons 1-5

Stars are classified by

The hottest stars are

A star system is a large group of thousands of stars that are grouped close together.

The length of a star's life depends on its

The earliest phase of a star's life before nuclear fusion occurs is called

The chemical reaction that produces light and energy in a star is called

Patterns of stars in the sky with imaginary lines between them are called

True or False. The galaxy that our solar system is in is called the Orion Galaxy.

Distances between stars are measured in a unit called a light year.

The true or actual brightness of a star from a standard distance is called

The brightness of a star as seen from Earth is called

When there are 3 stars in a star system they are called