"What If is an epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a ...

There are currently 92 moons known to orbit Jupiter. The four largest – Io, Europa, Ganymede and Callisto – were discovered by Galileo Galilei in 1610 when he pointed the first astronomical telescope ...

Now, all that’s left is to name the new moons. Sheppard and his team already proposed a name for the rebel moon. “Valetudo” — after the great-granddaughter of the Roman god Jupiter ...

While the moons are visible through 7×50 binoculars, if you want to catch these events in detail and enjoy the beauty of Jupiter's colorful clouds, a telescope with at least 6 inches of aperture ...

They are more commonly referred to as the Galilean moons of Jupiter owing to the fact that they were discovered by Galileo. The four Galilean moons – Io, Europa, Ganymede and Callisto – are ...

Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that ...

Ice moons such as Jupiter’s Europa and Saturn’s Enceladus are currently ... with a total volume of water twice that of all Earth’s oceans, despite this moon being considerably smaller ...

Six planets will form a rare planetary alignment in the night sky on Jan. 21; here is everything you need to know about the ...

The European Space Agency launched its Juice mission to explore the potential for life on Jupiter’s moons. WSJ’s Aylin Woodward explains what will happen on the eight-year journey and what ...

NASA's latest findings indicate that Jupiter's volcanic moon Io does not have a global magma ocean beneath its surface, debunking previous theories. This conclusion comes from analysis of data ...

from a camera called JANUS and a spectrometer to reveal the moons’ chemistry to the all-important J-MAG magnetometer that will measure the magnetic fields of Jupiter and its moons. In total they ...