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The Great Debate over whether the universe is small or large
The visible universe is vast. It is 93 billion light years across, and contains more than 100 billion galaxies. The average galaxy contains about 100 […]
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Recent multi-kiloton impact events: are they truly random?
It is customarily assumed that Earth-striking meteoroids are completely random, and that all the impacts must be interpreted as uncorrelated events distributed according to Poisson […]
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Rosetta glimpses its own shadow on comet 67P
The sharp-eyed science camera on Europe’s Rosetta comet orbiter caught a view of the probe’s fuzzy shadow when controllers guided the spacecraft just a few […]
