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An asteroid estimated to be upwards of 300 feet wide — the size of a football field — has been circling Earth for about 50 years but was only discovered this year by the Pan-STARRS 1 asteroid survey telescope, NASA announced ...

Earth is far more vulnerable than previously thought to asteroids like the one that exploded over the Russian city of Chelyabinsk in February, injuring over 1,000 people and shattering windows for miles, say scientists in new research While experts previously ...