NASA scientists have identified a new exoplanet, TOI-3261 b, with an extraordinarily short year lasting just 21 Earth hours.

At this altitude, orbital speed matches our planet's speed of rotation, allowing spacecraft to "hover" over the same patch of ground. For this reason, geostationary orbit is a popular destination ...

Ocular/orbital areas that contain liquid and other ... close to the detonation can sustain severe thermal burn when blink speed is less than the thermal wave speed. Wearing a visor designed ...