As you read this, the North American continent’s underside is dribbling away into Earth’s molten mantle. And according to ...

The photo of a 9.5-light-year-long cloud within the Eagle Nebula celebrates the space telescope’s upcoming 35th birthday.

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

Observations of Jupiter show that ammonia is unevenly distributed in the upper atmosphere, against expectations of uniform mixing. Scientists found evidence for a complicated but apparently real ...