8th grade: Life on other planets - lesson 1 (Wee ...

Many scientists want to work on a .......... because it has a great view of the stars.

Our planet, Earth, is becoming more and more ............ The world's population will reach 11 billion by 2100

Today, most people live on .........

This is the fourth planet from the Sun

People live on this machine in space.

You will be very cold in space because the ........... is very low.

We need to breathe this to live.

Venus is often called Earth's "sister planet". The two planets are almost the same size, so the gravity is very ............ to Earth's.

This stops you from flying in the air.

............. pulls us down to the ground.

We use this to measure if something is hot or cold.

........... is often called "the Red Planet." It's the 4th planet from the sun.

You can recognize ........... by its yellow clouds. It's the 2nd planet from the sun.

Human can't live on some planets because they don't have enough ......... to breathe.

This planet is very hot and close to the sun.

Earth's ............. is growing more and more quickly every year. I think that someday in the future, we will need to leave Earth and travel to new planets.

This is the planet we live on.

Mars is much smaller than Earth, so the gravity there is very low and there isn't much .............