After a five-year journey, NASA's Juno spacecraft this week reached Jupiter and was successfully inserted into its orbit.
NASA's Juno spacecraft captured a unique time-lapse movie of the Galilean satellites in motion about Jupiter.
Europe's Galileo sat-nav system, a rival to America's GPS, took a step closer to becoming operational Tuesday with the launch of a fresh pair of satellites to join a dozen already in space.
Europe's Galileo sat-nav system, a rival to America's GPS, should move closer to operation with the launch Tuesday of a fresh pair of satellites to join a dozen already in space.
Europe's latest navigation satellites, launched last December, have been officially commissioned into the Galileo constellation, and are now broadcasting working navigation signals.
Saturn's beautiful rings form a striking feature, cutting across this image of two of the planet's most intriguing moons.
Since January, there have not been any planets to see in the evening sky. Instead, all five bright planets have been visible in the early hours before sunrise. But now Jupiter, the king of the planets, is making a return ...
Europe's ninth and tenth Galileo satellites have started broadcasting working navigation messages.
The next Galileo launch campaign has begun with the arrival of the latest pair of navigation satellites at Europe's Spaceport in French Guiana.
In 1610, Galileo Galilei looked up at the night sky through a telescope of his own design. Spotting Jupiter, he noted the presence of several "luminous objects" surrounding it, which he initially took for stars. In time, ...