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1932

Story Behind a Picture

What the image of the Milky Way’s black hole really shows

The massive object at the galaxy’s center is invisible. But this year’s picture of the swirling plasma around its edges will help to reveal more about the galaxy’s history and evolution.

The danger lurking in an African lake

Kivu is no ordinary lake, with dense depths packed with methane and carbon dioxide gas. Its features hold aquatic puzzles, explosive hazards and the capacity to provide valuable energy.

Hotter than the sun: The mysterious solar corona

Several new missions aim squarely at a long-standing astronomical conundrum, with the promise of improving space-weather predictions

The base of the iceberg: It’s big and teeming with life

Passing chunks of ice can fertilize ocean waters and play a role in the planet’s carbon cycle

The marks of extinction

The mass die-offs of Earth’s past may hold clues to our future

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