On an ice-crusted ridge 3,000 feet above the angry swell of the South Atlantic, Emma Nicholson takes a deep breath behind her respirator, checks her climbing harness, and steps inside the gaping mouth ...
New secrets about Jupiter's volcanically volatile moon Io have been revealed by NASA's Juno probe. Io, Jupiter's third-largest moon, is covered in lakes made of lava, according to a new paper in the ...
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