The Mechanics of Earth's Spin Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 ...

Using new data from NASA’s Cassini spacecraft, researchers believe they have solved a longstanding mystery of solar system science: the length of a day on Saturn. It’s 10 hours, 33 minutes and 38 ...

Astronomers using NASA’s Hubble Space Telescope have measured the rotation rate of an extreme exoplanet by observing the varied brightness in its atmosphere. This is the first measurement of the ...

An instantaneous cessation of Earth's rotation would result in catastrophic, planet-wide devastation due to the inertia of objects on the surface moving at high speeds (approximately 1000 mph at the ...

Astronomers have captured the first-ever spin measurements of HR 8799, the famed system that made history as the very first exoplanetary system to have its image taken. Discovered in 2008 by two ...

A planet's year length depends on its distance from the Sun. Planets closer to the Sun have shorter years. A planet's rotation speed is unrelated to its year length. Planets' orbital speeds vary ...

Uranus is the only planet that rotates sideways with a 98-degree tilt. Learn why Uranus spins this way, how its seasons last ...

THE recent radar measurements of Mercury indicate that the period of rotation of the planet is 59 ± 5 days 1. This result is in complete disagreement with the previously quoted value of 88 days based ...

Scientists may finally have an answer for why the ferocious jet streams on the solar system’s giant planets blow in opposite ...