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

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

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

Solve our latest interactive crossword. We'll publish science-themed crosswords and math puzzles on alternating months.