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An alien star passed through our Solar System just 70,000 years ago, astronomers have discovered. No other star is known to have approached this close to us.

2015-02-18

 star gravity Solar system
A lone researcher working with borrowed data may have beaten a $700 million NASA mission to the finish line by being the first to measure an obscure subtlety of Einstein's general theory of relativity...

2007-01-18

 gravity
If the technology can be made to work effectively, it will allow scientists to probe the Universe in a way that is not dependent on light, and should, theoretically, allow them to look right back to the first moments after the Big Bang.

2006-04-19

 gravity

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