New calculations reported by Live Science indicate Jupiter was once much larger and is still contracting as it cools, offering constraints on early solar system conditions.

Pluto's days, though they drag on a bit at around 153 hours, are nothing compared to its years. Pluto's orbit takes 248 Earth ...

Often misunderstood as "hovering," satellites are actually in constant free-fall, perpetually missing Earth's surface as the ...

Although Europa is the fourth largest of Jupiter’s 95 moons, it’s the smallest of the Galilean moons – the largest being Ganymede. With an equatorial diameter of about 3,100 kilometres, Europa is ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

Astronomers may have finally worked out how planets between the size of Earth and Neptune – which aren't found in our Solar ...

One of the biggest recent surprises in astronomy is the discovery that most stars like the Sun harbor a planet between the ...

A powerful solar storm could cripple Earth's satellite infrastructure within days, a new paper warns. Increased satellite ...

Two separate research teams have observed a previously unseen microlensing event, confirming the existence of a particular ...

Scientists measured mass and distance of free floating planet drifting through space without star for first time.

High-resolution study of Jurassic mudstones in China’s Sichuan Basin reveals that astronomical cycles control climate, ...

Scientists have discovered a rogue planet roaming the Milky Way after combining observations from Earth and a space telescope ...