what are the three new planets in the universe?

Question

since pluto has been debated although not finalized if its a planet.

Answer 1

The proposed new planets include Pluto, although it has a moon and is called a double planet.

1.Ceres, between Mars and Jupiter
2.Charon - thought to be a moon of pluto now is a double planet
3. 2003 UB313 - possible nick name is Xena, slightly bigger than Pluto.

You probably mean solar system, not universe :)

Update: The international astronomical union has demoted those 3 planets to (including pluto) to dwarf planets. So officially there are now 8 planets and 3 dwarf planets

Answer 2

There haven't been any new planets in the solar system for billions of years. I don't know about the universe, we don't have enough information on that.

I know that there is a debate on what to CALL four bodies that circle the sun, Sol. Three of them we've known about for a while.

Pluto has been considered a planet. Ceres has been considered an asteroid. Charon has been considered a moon. "Xena" was recently discovered. This is what has led to the discussion on what the should be the definition of planet.

Here's mine.

I would say that the following are minimum characteristics of planets.

1 & 2 below are arbitrary, you may prefer other variables.

1. Minimum Mass. 10^20 Kg. (about 1/100th the mass of Pluto).

2. Minimum Diameter. 1,500 Km (about 900 miles)

3. Orbit. Must be in orbit around a sun, and not a planet (therefore, Luna is not a planet, even though it's larger than Pluto).

4. Distance from sun. Not relevant, as long as it is clearly in orbit around the sun. Therefore, a massive sun may have planets dozen's of light-years away.

5. Is not itself a sun. That would be a binary or higher system.

6. Must not be in interstellar space, not associated with a sun or suns.
7. Not in a field of other bodies with the same approximate orbit. That would leave out anything in the Asteroid Belt and Oort Cloud.

So, I say that Pluto is a planet.

Now, how about "Xena" (aka, 2003 UB313)? To Hades (Greek God of the underworld) with conventions for naming planets. Xena is perfect. And Gabrielle for the moon. If they can name a comet "Hale-Bopp" why not a planet after the Warrior Princess.

Now, I disagree with Charon and Ceres getting a promotion. One shares an orbital field with thousands of smaller objects that have more mass in total that Ceres.The other circles a planet, it's a moon.

If Charon is a planet, then what about Luna and some moons of Jupiter and Saturn?

Some have suggested that a moon must have an orbit whose barycenter is inside a planet. It's an interesting argument, but it depends on the density of the planet involved. That is why Charon is under consideration. It's barycenter with Pluto is outside of Pluto, and therefore, under this definition, Pluto and Charon would make up a binary planetary system within the solar system.

I'm not quite convinced on this one. If Pluto's mean density were that of Saturn's, but the mass stayed the same as Pluto's, the barycenter would be inside of Pluto. Thus, Charon's status would depend on Pluto's physical characteristics. It doesn't make sense to me to call Charon a planet in one case and a moon in the other.

Answer 3

I think you mean "three new planets in the Solar System" (not universe).

Pluto has always been a planet. They did debate whether it should continue to be a planet, and that hasn't changed.

The three new planets proposed are Ceres, Charon and 2003 UB313 (Xena). There are other candidate planets waiting for consideration too, but they will not be considered at the current session.

Answer 4

I thought the three that were up for debate wasn't made into planets yet...

I could be wrong... but I thought they weren't accepted yet.
So technically there is no "three NEW" planets ... at least, not until they add them.

IF they have added them let me know ;-)

P.S.
"happy_84 k"
has a good point.

Answer 5

ceres, charon and xena

Answer 6

u mean in the solar system, and they r not new! they r newly discovered....