Exploring Space

How many planets revolve around the sun?

• 6

• 7

• 8

• 9

What type of object is the sun?

• Planet

• Nebula

• Star

• Galaxy

The sun is part of a galaxy called the ______ ___.

The Milky Way galaxy is one of __________ of galaxies in the universe.

• hundreds

• thousands

• millions

• billions

Electromagnetic radiation is also called ____________ _________.

• A spectrum

• Radio waves

• Radiant energy

• Visible light

Gamma rays are released by what type of stars?

• Hot stars

• Cold Stars

The moon does not generate its own light - we can see it because it reflects light from the sun. We can refer to it as luminous.

• True

• False

What is the speed of an electromagnetic wave?

• 300,000 m/s

• 3.0 x 10^-16 m/s

• 3.0 x 10^-8 m/s

• 3.0 x 10⁸ m/s

How long does it take for light from the sun to reach us on earth?

• 5 s

• 50 s

• 500 s

• 5000 s

We can use the electromagnetic spectrum to tell what the universe was like billions of years ago.

• True

• False