In trying to explain the spectacular star trails of the star cluster Palomar 5, astronomers stumbled on a very large trove of black holes.
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Astronomers Find an Unexpected Bumper Crop of Black Holes

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Science

Ahead of a project to spray carbon dioxide into jungle plots, researchers contemplate what its results might signal about the forest’s future.
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A Long-Awaited Climate Experiment Is Poised to Launch in the Amazon. What Will It Find?

After years of delay, researchers are ready to inject carbon dioxide into jungle plots.
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A Singular Climate Experiment Takes Shape in the Amazon

Years in the making, a project in the Amazon rain forest is finally set to determine whether a rise in carbon dioxide could save one of the world’s largest carbon sinks.
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Will the Amazon Help Save the Planet?

Cows and at least one person in the U.S. have been sickened by avian influenza. We asked experts about the risk to humans.
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How Big a Threat Is Bird Flu?

Volcano detectives use artificial intelligence to sleuth out ancient secrets in Alaska.
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Astronomers Find an Unexpected Bumper Crop of Black Holes

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