Unit 4 Lessons 1 and 2

Front

What are factors of a star's apparent brightness?

Back

temperature, distance, size

Front

Higher the temperature, the greater the apparent brightness of a star.

Back

Front

Compared to cooler stars, hotter stars are _____________.

Back

brighter

Front

What is a light year?

Back

A unit of distance used to measure objects in space. Its the distance that light can travel in one year. (9.5 trillion km/year)

Front

Where does the energy of a star come from?

Back

the core

Front

Stars produce bright light because

Back

they are very hot

Front

What would happen to the Earth without the sun's gravity?

Back

Earth would drift into space.

Front

Earth's gravity is strongest........

Back

near the ocean

Front

The sun is about ____________ times bigger than Earth.

Back

one million

Front

What causes a star to produce light?

Back

The intense heat at the core of the star