The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

The spacesuit worn by the first Briton in space, the Soyuz that brought the first UK astronaut back to Earth and the only ...

Giant Exoplanets in HR 8799 System Likely Formed Like Jupiter and Saturn The first exoplanet was discovered in the 1990s, but ...

Four small, newly discovered worlds are less than six light-years away from Earth, and their discovery reinforces a ...

The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in HR 8799, a multiplanet system 130 light-years away that has long been a ...

Bothell, Wash.-based Portal Space Systems shows off the lab where its solar thermal propulsion system will be developed.