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Physics & Astronomy Facts

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The Brave and Cold Ulysses

Deep space is cold. Very cold. That's a problem--especially if you're flying in an old spaceship. And your power supplies are waning. And the fuel lines could freeze at any moment. Oh, and by the way, ...
Color image of the Antennae galaxies (NGC 4038/4039)
The First Starlight

Imagine being able to see our Universe 14 billion years ago when it was just a baby. If we had a time machine, we could go back and watch how its infant features emerged after the Big Bang. There are ...
Chandra X-ray Observatory
X-ray Telescopes

X-rays are a highly energetic form of light, not visible to human eyes. Light can take on many forms -- including radio waves, microwaves, infrared, visible, ultraviolet, X-ray and gamma radiation. Ve ...

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