CNN:   Once upon a time, gazing at the night sky was an escape from manmade messiness on Earth. Not anymore. Nearly 70 years after the launch of Sputnik, there are so many machines flying through space, astronomers worry their light pollution will soon make it impossible to study other galaxies with terrestrial telescopes. Then there is the space junk — nearly 30,000 objects bigger than a softball hurtling...

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