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NASA

Touching the Sun

The Sun, the fiery heart of our solar system, has fascinated humanity for centuries. Despite the progress of modern science, many of its secrets remain locked away, particularly the mysteries of its outer atmosphere, the corona.

2021 Arctic summer sea ice 12th-lowest on record: NASA

Less sea ice melted in 2021 even as the planet as a whole was warmer than usual -- with new temperature records in North America and Eurasia, drought in the US West, and episodes of intense melting on Greenland's ice sheet.