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 ...

Tracking the rotation speed of solid planets, like the Earth and Mars, is a relatively simple task: Just measure the time it takes for a surface feature to roll into view again. But giant gas planets ...

For nearly a billion years, Earth’s rotation stopped slowing down. Locked in a rare cosmic balance, the planet’s day remained ...

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 ...

Astronomers have made an unexpected discovery about the planet TOI-3884b, which orbits its star at a crazy angle. The planet’s orbit is tilted by around 62 degrees compared to the star’s rotation, and ...

Earth's rotation on its axis is the fundamental reason for the cycle of day and night. As our planet spins, one side faces the Sun, experiencing dayli ...