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Oct 30, 2015 05:32 PM ET // Ian O'Neill
Europe's Rosetta mission has found that Comet 67P/Churyumov-Gerasimenko is spewing molecular oxygen into space -- why would this be a bad thing for the hunt for extraterrestrial life?
Oct 28, 2015 01:45 PM ET // Irene Klotz
The comet being studied by Europe’s Rosetta spacecraft contains molecular oxygen, a surprising discovery that will force scientists to rethink details of how the solar system formed.
Oct 23, 2015 10:10 AM ET // Irene Klotz
The chosen site, Oxia Planum, is laced with tantalizing chemical fingerprints of clays and other minerals.
Sep 30, 2015 12:10 PM ET // Elizabeth Howell
Earlier this month, the ExoMars launch date was pushed back by a couple of months. Instead of launching in January 2016, the European mission will launch the following March -- but still get to Mars at nearly the same time. How is this possible?
Sep 28, 2015 10:40 AM ET // Irene Klotz
Scientists have solved the mystery of why the comet being studied by Europe’s Rosetta spacecraft is shaped like a rubber duck -- it started off as two separate comets.
Sep 24, 2015 07:00 AM ET // Ian O'Neill
The supermassive black hole in the center of our galaxy has started to stir and astronomers are pondering whether the uptick in flare activity has been triggered by the passage of a mysterious dust-enshrouded star.
Sep 23, 2015 01:00 PM ET // Irene Klotz
Scientists have discovered an unexpectedly regular cycle of ice formation and depletion on the surface of a comet, a pattern tied to an orbital dance of shadow and sunlight.
Sep 16, 2015 06:50 AM ET // Jason Major
The wake of a ship slices into the eye of an algal maelstrom in this image, acquired by ESA's Sentinel-2A satellite on Aug. 7, 2015.
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