Grade 9 Topic 3

The Sun is part of a larger system, or galaxy, called ____________.

• Andromeda

• the Milky Way

• IC 1613

• Tucana dwarf

In the past, most people thought that __________.

• the Earth was inside the Sun

• the Earth was the center of the universe

• a potato was the center of the universe

• the moon was much larger than the Earth

The Milky Way galaxy contains ____________.

• 200-400 billion stars

• 100,000 stars

• 20-30 stars

• 1 million stars

How many planets are in our solar system?

• 3

• 7

• 8

• 9

What energy do electromagnetic waves carry?

• mechanical energy

• radiant energy

• chemical energy

• nuclear energy

What is the shape of the Milky Way?

• spiral

• double-helix

• cube

• elliptical

What is a light year?

• 1 million years

• The distance light travels in 1 year

• How long it takes for light from the Sun to reach the Earth

• A year with no nights

We are about ___________ from the center of the galaxy.

• 26,000 light years

• 83 meters

• 600,000,000 light years

• 1,800,000 km

Why might the Earth be unique?

• it might be the only planet in the universe

• it might be the only place with life

• it might be the only place with water

• it might be the biggest planet in the universe

What is at the center of the Milky Way galaxy?

• the Earth

• the Sun

• a supermassive black hole

• the Oort Cloud