Loki Patera is 202 kilometres (126 mi) in diameter, covers 20,000 sq km (7,700 sq mi), and was the largest volcanic feature found on Io until these new observations revealed the hot spot in the south ...

The four largest – Io, Europa, Ganymede and Callisto – were discovered by Galileo Galilei in 1610 when he pointed the first astronomical telescope at the Moon, Venus and the planet Jupiter in quick ...

Today, these four moons are collectively known as the “Galilean satellites,” a tribute to their discoverer. In 1614, the German astronomer Johannes Kepler suggested naming the satellites after ...

On Dec. 27, 2024, NASA's Juno spacecraft swooped by the volcanic world Io. It witnessed a giant eruption.

Galileo’s repeated observations over several nights and realized they were moons orbiting the gas giant. And thus, Io, Europa and Ganymede became known as the Galilean moons of Jupiter.

Venus, Jupiter, and Mars dominate the sky. Catch your last views of Saturn as early in the month, the Moon passes in front of ...

And thus, Io, Europa and Ganymede became known as the Galilean moons of Jupiter. Learn more about NASA’s current mission to Europa here. Multimedia editor Rob Landers wrote and verified this ...

Astronomers still refer to the four moons as the Galilean satellites in honor of their discoverer. In 1614, the German astronomer Johannes Kepler suggested naming the satellites after mythological ...

with four particularly large ones known as the Galilean moons (Io, Europa, Ganymede, and Callisto). These moons exhibit diverse characteristics, from volcanic activity on Io to the potential for a ...

NASA has captured the highest-resolution photo of Europa, one of Jupiter’s moons. The image, which NASA released last week, showcases over 93 by 125 miles of surface region on the moon.

The four Galilean moons – Io, Europa, Ganymede and Callisto – are now four of over 90 moons of Jupiter that are officially recognised by the International Astronomical Union. But these four ...