Looking for a new Earth.

Why is it important to measure the distance between the planet and the sun?

• because the distance affects the gravity of the planet.

• because the planet can be too far or too close

• because the sun can explode

What is Earth's star?

• The moon

• The sun

• Cassiopeia

How many planets orbiting suns have astronomers found?

• Hundreds

• Thousands

• Millions

What things do astronomers look for in a planet?

Rocks are important because living organisms are found under them.

• True

• False

Gliese 581g is colder than Antarctica.

• True

• False

How many days does Gliese 581g have in a year?

• 365

• 366

• 37

Earth is a trillion km from Gliese 581g

• True

• False

large round objects in space made of rock and metal, or gas

• Astronomers

• Planets

• Stars

A large round object of burning gas in space.

• Rock

• Star

• Orbit