Human can't live on some planets because they don't have enough ......... to breathe.
Oxygen
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15
........... is often called "the Red Planet." It's the 4th planet from the sun.
Mars
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baam
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fairy
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fairy
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baam
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15
You will be very cold in space because the ........... is very low.
Temperature
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15
We need to breathe this to live.
oxygen
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15
............. pulls us down to the ground.
Gravity
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15
Our planet, Earth, is becoming more and more ............ The world's population will reach 11 billion by 2100
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thief
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gift
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rocket
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lifesaver
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15
Many scientists want to work on a .......... because it has a great view of the stars.
Space Station
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15
We use this to measure if something is hot or cold.
temperature
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Venus is often called Earth's "sister planet". The two planets are almost the same size, so the gravity is very ............ to Earth's.
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15
This planet is very hot and close to the sun.
Venus
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monster
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seesaw
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gift
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banana
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15
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.