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Planetary Science

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Kepler-452b and Kepler-22b

PLANETARY COUSINS Planets may be lumped into two groups: smaller and rocky like Kepler-452b (left), or bigger and gassy like Kepler-22b (right).

Eclipse in Svalbard

NIGHT AND DAY  Solar physicists gained new insight into the origins of coronal mass ejections as they watched the 2015 solar eclipse darken the sky above Svalbard, Norway.

Jupiter tropical zone

CLOUD TOWERS  The tiny white spots in this image of Jupiter’s south tropical zone, taken May 19, 2017, by NASA’s Juno spacecraft, are actually towers of clouds composed of ammonia ice and, perhaps, water ice. Located high in Jupiter’s atmosphere, these towers can stretch about 50 kilometers wide and reach roughly 50 kilometers tall.

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