First invented in China, the development of the liquid-oxygen form of these allowed humans to go into space.
Rocket
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15
a unit of length in astronomy equal to the distance that light travels in one year or about 5.88 trillion miles (9.46 trillion kilometers)
Light-year/ Lightyear
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thief
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25
gift
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gift
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banana
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15
What is a UFO?
a mysterious object seen in the sky for which it is claimed no scientific explanation can be found, often supposed to be a vehicle carrying extraterrestrials
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15
What is a person who goes into space called?
Astronaut
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seesaw
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magnet
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shark
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lifesaver
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15
What is it called when the moon blocks our view of the sun?
A (solar) eclipse.
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15
Name all the planets in our solar system.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
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15
When you wish upon a âĶâĶâĶâĶâĶ.
(Shooting) Star
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15
What is this (currently orbiting the earth)?
Satellite
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gift
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lifesaver
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15
In what year did the first moon landing take place?