Astronomers searching for additional planets beyond Neptune had reserved the name "Xena" for the "warrior princess" of the 1990's TV show. When they discovered a planet larger than Pluto, they assigned that as a provisional name.
After the IAU demoted Pluto from "planet" to "dwarf planet", the object tentatively named "Xena" received a permanent name of "Eris".
Eris is believed to have one moon.
No
Yes it is called Dysnomia.
Pluto ... which I think was the first member of the newly-defined "dwarf planet" category ... has two known moons.
Ceres does not have any moons or natural satellites. As far as we know at present, Ceres does not have any moons. Ceres, the smallest dwarf planet, has no known moons. However there are other dwarf planets with moons that we know of such as Pluto and its moon Charon.
There are 176 known moons that have been discovered so far in our solar system. These are small bodies that orbit a planet or dwarf planet. 169 moons orbiting six planets (includes Earth's Moon) 7 moons orbiting three dwarf planets There are other bodies that orbit the Sun, or that orbit dwarf planet candidates. There are as many as 58 satellites of trans-Neptunian objects (TNOs) and around 104 asteroid moons (orbit around larger asteroids).
The dwarf planet Eris was known as Xena by the team that discovered it's existence. This name was used informally by the team and the media. An official name would have to have a name from creation mythology according to IAU standards. The name "Persephone" has also been considered (it would have been fitting next to Pluto) but it is already the name of an asteroid.
1. Mercury 2. Venus 3. Earth 4. Mars 5. Ceres (Dwarf Planet) 6. Jupiter 7. Saturn 8. Uranus 9. Neptune 10. Pluto (Dwarf Planet) 11. Makemake (Dwarf Planet) 12. Haumea (Dwarf Planet) 13. Eris (Dwarf Planet) (Note: Neptune, Pluto, and the other dwarf planets the exception being Ceres are not always in this order but this is how they are in distance from the sun the majority of the time)
Venus and Mercury are the only planets in the Solar System that do Not have any moons. Even Pluto, a dwarf planet, has a moon.
Saturn has more moons than any other planet
There are no moons in orbit around Venus. It might help you to know there are also no moons orbiting Mercury either. Earth has only one moon, and all the other planets in our solar system have multiple moons. Even the dwarf planet Pluto has three moons.
Earth has one moon. Mars has two moons and Pluto, the dwarf planet has one moon. Mercury and Venus don't have any moons, and Jupiter has 63 known moons. Uranus has 27 moons, Neptune, 13, and Saturn has 60 moons.
You mean moons? No.