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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seesaw
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seesaw
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fairy
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banana
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15
We use this to measure if something is hot or cold.
temperature
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Mars is much smaller than Earth, so the gravity there is very low and there isn't much .............
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This is the fourth planet from the Sun
Mars
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This is the planet we live on.
Earth
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............. pulls us down to the ground.
Gravity
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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.
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Many scientists want to work on a .......... because it has a great view of the stars.
Space Station
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Our planet, Earth, is becoming more and more ............ The world's population will reach 11 billion by 2100
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Human can't live on some planets because they don't have enough ......... to breathe.
Oxygen
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monster
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magnet
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shark
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thief
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Today, most people live on .........
Earth
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heart
Other team wins 25 points!
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rocket
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gift
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banana
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People live on this machine in space.
Space station
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You can recognize ........... by its yellow clouds. It's the 2nd planet from the sun.
