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.

Of all the major planets in the solar system, Jupiter is the largest. Observers have a ring-side seat this week to view this amazing world. Jupiter reached opposition on April 7, meaning it is at the ...

Sky This Week is brought to you in part by Celestron. Friday, February 6The bright star Sirius dominates the southern sky ...

Europa, one of the four large moons of Jupiter first seen by Galileo 414 years ago, may have a deep, salty, global ocean hidden beneath a thick crust of ice. Where there is water, there might be life.

Europa is the fourth largest of Jupiter's 95 moons and about 90% the size of Earth’s Moon. Its surface, covered in water ice, reflects five and a half times more sunlight, making it much brighter.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Jupiter's four largest ...