The Cassini spacecraft looks toward the Rhea's cratered, icy landscape with the dark line of Saturn's ringplane and the planet's murky atmosphere as a background. Rhea is Saturn's second-largest moon, ...

The atmospheric carbon dioxide was thought to be the result of the oxidation of oxygen molecules in the exosphere. As a consequence of this discovery, Rhea became the first Saturnian moon, and only ...

Looking for a sky event this week? Check out our full Sky This Week column. January 25: Aries' Hoofprint Saturn's four brightest moons are lined up for ideal viewing this evening. You can catch the ...

Saturn is the planet in our solar system with the most moons - 146 known natural satellites. However, not all of them are visible, and only seven can be spotted through a reliable telescope from Earth ...

Add Yahoo as a preferred source to see more of our stories on Google. On Dec. 23, 1672, Italian astronomer Giovanni Cassini discovered Rhea, Saturn’s second-largest moon. Rhea is made up of rock and ...

Saturn and the moon will appear close together in the night sky in an event known as a conjunction. The celestial event will be visible for one night on Friday, Jan. 23, 2026, after sunset. Viewers in ...