Which Galaxy is part of our cosmic address?

• the Milky Way Galaxy
• the Andromeda Galaxy
• the Large Magellanic Cloud
• the Whirlpool Galaxy

Distances in deep space are so large that scientists often measure them in units of _____

• kilometers
• astronomical units
• gigameters
• light years

The light-year is a measure of _____

• time
• brightness
• distance
• speed

In one second light can travel around the whole Earth _____

• twice
• four times
• seven times
• eleven times

A light year is the distance that light travels _____

• going across our galaxy
• going once around the Earth
• in one year
• in one second

If the solar system was the size of a classroom, _____ would be the size of a grain of salt

• the Earth
• the Sun
• the Earth's orbit
• the Moon

If the solar system was the size of a classroom, _____ would be the size of a compact disc

• the Earth
• the Sun
• the Earth's orbit
• the Moon

If the Milky Way was the size of a classroom, _____ would be the size of a playing die

• our solar system
• the Sun
• the Earth's orbit
• our solar neighbourhood

If the observable universe was the size of a classroom, the Milky Way would be _____

• the size of a playing die
• the size of a grain of salt
• microscopic, like a bacterium
• smaller than microscopic

How long does it take for light from Proxima Centauri to reach Earth?

• 4 minutes
• 8 minutes
• 4 years
• 8 years