A-Z Quick Facts: Axial Tilts of the Planets

Each planet in our solar system has a different axial tilt, with Venus and Uranus having the most extreme, with respective tilts of 177 degrees (upside down!) and 97 degrees. In contrast, Mercury has a very small tilt (0-2 degrees) and Jupiter is tilted by three degrees. All the other worlds have tilts that vary somewhere in the twenties, with Neptune at around 28, Saturn 26, Mars 25, and of course our own Earth at 23 degrees.

References:
https://www.universetoday.com
http://www.astronomynotes.com/tables/tablesb.htm (note it says Mercury’s tilt is ~0 degrees)

Neptune’s Moons

Neptune has the fewest moons of all the gas giants, with a total tally of thirteen confirmed moons, with one additional unconfirmed (to date). In keeping with their parent planet being named for an Ancient Roman sea god, all the moons have names that refer to mythical sea gods or nymphs. Most of Neptune’s moons are small and irregularly shaped, with at least a couple doomed to end their lives by either being torn apart by Neptune’s gravity as they spiral past the Roche Limit, or crash into the planet itself. Here, I will go in alphabetical order through the known, confirmed moons of this beautiful blue ice giant.