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Astronomy

A gas clump in the Milky Way’s neighborhood might be a ‘dark galaxy’

A blob of gas seen outside the Milky Way could be a type of starless, dark matter–dominated galaxy. Some scientists are skeptical.

Environment

Fires in the Amazon forest may melt sea ice in Antarctica

Satellite data reveal a link between the amount of black carbon in the atmosphere and rates of Antarctic sea ice loss in recent years.

Humans

Ancient horse hunts challenge ideas of ‘modern’ human behavior

An archaeological site in Germany suggests communal hunting and complex thinking emerged earlier in human evolution than once thought.