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The mystery of where Earth's water came from got murkier Wednesday when some astronomers essentially eliminated one of the chief suspects: comets.
Landing with a bounce after traveling 4 billion miles, a European spacecraft made history Wednesday by successfully reaching the icy, dusty surface ...
A pristine distant comet created a once-in-8-million-year fireworks show above Mars last month. But no one got to see it live. New NASA data from ...
Comets news and stories
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