Over 240, as of mid-2010.
There are about 170 known moons in our solar system and probably hundreds of billions more in other solar systems in our galaxy.
153
153
153
Jupiter has the highest number of moons in our solar system, currently with 79 known moons.
No planet in the solar system has that number of moons. There is a gap in numbers between Saturn's 63 known moons and Uranus' 27 known moons.
To date, Jupiter is in the lead with 67 confirmed moons; Saturn is a close second with 62 moons with confirmed orbits.
The planet Jupiter has the most known moons of any planet in our solar system, with 63 (as of 2011). Saturn has 62 known and named moons, but may have more depending on the classification of the many small bodies within its ring system.
Jupiter has the highest number of known moons. The figure currently stands at 63, though more could be discovered.
No planet in our Solar System has 21 moons. See related question for information concerning moons in our Solar System
Depending on the known moons,including Pluto, there are 170 moons in our solar system that scientists have confirmed and observed.
Out of the planets in our Solar System, Jupiter has the most moons. It has 63 confirmed moons.