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, ...

Jupiter's four Galilean moons will line up in front of Jupiter in the early morning sky on Aug. 8. The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up ...

One day after launching a Starship rocket on a dramatic test flight in Texas, SpaceX fired off a Falcon Heavy rocket from Florida on Monday, sending a $5.2 billion NASA probe on a 1.8-billion-mile ...

At around 10:00 p.m. local time on Sunday (Nov. 9), if you look low toward the east-northeast sky, you will see a waning gibbous moon, 72 percent illuminated, and shining prominently below it will be ...

Nearly half a billion miles from Earth, a world may be stirring. Our planet is the only place in the solar system—and indeed the universe—where we know that life exists. But if the basic sciences of ...

The moons were discovered by a group of astronomers from Taiwan, Canada, the United States, and France. Between 2019 and 2021, they used the Canada France Hawaii Telescope to repeatedly monitor the ...