
NASA astronaut Nick Hague takes a “space-selfie” with his helmet visor up and the Earth 260 miles below him.

NASA astronaut Christina Koch enters the Quest airlock moments before completing her first spacewalk to upgrade the International Space Station’s…

The International Space Station flew 265 miles above this cloudy formation in the south Indian Ocean.

NASA astronaut Nick Hague participates in his second spacewalk to upgrade the International Space Station’s power storage capacity.

NASA astronaut Christina Koch participates in her first spacewalk to upgrade the International Space Station’s power storage capacity.

Illustration of NASA’s OCO-3 mounted on the underside of the International Space Station

This map shows solar-induced fluorescence (SIF) measured by OCO-2 from Aug. through Oct. 2014.

Illustration of OCO-3 on the space station collecting data in snapshot mode over the Los Angeles Basin.

In Alaska, 5 percent of the land is covered by glaciers that are losing a lot of ice and contributing…