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A pulsar draws material from its companion star.
Rossi X-ray Timing Explorer Solves Mystery of Pulsar 'Speed Limit'

Gravitational radiation, ripples in the fabric of space predicted by Albert Einstein, may serve as a cosmic traffic enforcer, protecting reckless pulsars from spinning too fast and blowing apart, acco ...
The Apollo 11 lunar laser ranging retroreflector array.
An Old Science Experiment On The Moon

The most famous thing Neil Armstrong left on the moon 35 years ago is a footprint, a boot-shaped depression in the gray moondust. Millions of people have seen pictures of it, and one day, years from n ...

What is Dark Energy?

Because he originally thought the Universe was static, Einstein conjectured that even the emptiest possible space, devoid of matter and radiation, might still have a dark energy, which he called a 'Co ...

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