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What is Infrared?
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Teachers
What is Infrared?
Ask an Astronomer
Teachers
Universe & Space
What would happen if you pour water into space?
Could a helium balloon float all the way up into space?
Where does outer space begin?
Can you hear sound in space?
How many galaxies are in the Universe?
How old is the Universe?
Where is the center of the Big Bang?
How big is the Universe?
How was the Universe made?
How old is the Universe?
Most astronomers think that the universe is between 10 and 20 billion years old.
