In January 1610, Galileo Galilei, using a newly improved telescope with 20x magnification, observed four celestial bodies orbiting Jupiter, initially appearing as stars. These bodies, later named Io, ...

The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up next to the "King of the Planets" as it voyages through the stars of the constellation Gemini.

Most of us know four moons of Jupiter, called the Galilean moons because they were first discovered by Galileo in 1610. Named for figures closely associated with Jupiter from Greek mythology, Io, ...

Some celestial events are worth getting up early for - or perhaps staying up late for. Early risers and/or night owls on Flag Day (Wednesday) morning, given fair weather and clear skies, will be ...

As a newborn planet, Jupiter glowed brightly in the sky and outshined today’s sun from the perspective of the gas giant’s largest moons. That early radiance—and upcoming visits by multiple ...

The top half of the frame shows Jupiter and its four brightest moons through a telephoto lens — similar to what you'd see through binoculars. The bottom half zooms in to show each moon's unique ...

The quest to understand the chemical makeup of distant celestial bodies is gaining momentum thanks to the advanced capabilities of NASA’s James Webb Space Telescope (JWST). A recent study, submitted ...