The sheer number of objects suggests scientists will soon have to grapple with what counts as a moon versus what’s just a ...

The smashups are thought to have occurred at least 100 million years ago, but the moons they created are new to astronomers.

The ringed gas giant Saturn has officially replaced Jupiter as the planet in our solar system with the most moons. The ...

The objects around the ringed planet are tiny, but some of them may have formed relatively recently in the solar system’s ...

Saturn just solidified its title as ‘moon king’ with an updated tally of 274 satellites orbiting the gas giant. The ...

Canadian and other researchers have confirmed Saturn as the solar system’s undisputed “moon king," after discovering 128 more ...

In August 2006 the International Astronomical Union General Assembly adopted a resolution to reclassify Pluto as a dwarf planet. The reasoning was that it didn't satisfy one of three newly defined ...

All of the newly discovered moons are classified as "irregular moons," which are objects captured by Saturn early in the ...

“These moons are a few kilometers in size and are likely all fragments of a smaller number of originally captured moons that were broken apart by violent collisions, either with other Saturnian moons ...

Space scientists have announced Saturn has 128 new moons. New findings have unveiled a new total of 274 moons, almost twice as many as all the other planets combined. The International Astronomical ...

In 2006, the International Astronomical Union reclassified Pluto as a dwarf planet because it doesn't meet all the criteria for full planet status. Pluto was discovered 95 years ago on Feb. 18 ...

The International Astronomical Union reclassified Pluto as a dwarf planet because it does not clear its orbit of other debris. Pluto was the little planet that could — until it couldn’t.