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 ...

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 ...

Scientists found two Earth-sized planets and a third candidate orbiting a nearby double star system, TOI-2267.

The Earth will complete a full rotation at a faster rate than usual today, according to Space.com. The planet’s rotation will be approximately 1.34 milliseconds less than the usual 24 hours we are ...

CAPE CANAVERAL, Fla. (AP) - A day at Uranus just got a little longer. Scientists reported Monday that observations by the Hubble Space Telescope have confirmed it takes Uranus 17 hours, 14 minutes and ...

Mercury switches from the evening to morning sky this month, while the giant planets dominate the night. The moons of Jupiter ...

If you think you've met the wildest exoplanet yet, you haven't learned about TOI-4507 b. This strange world breaks almost every known rule for how planets should behave.

Earth's day used to be five hours shorter, and it's predicted to continue lengthening over time. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.