Are there other planets, similar to Sedna and Pluto in the Solar system?

Answer 1

1. Pluto, Sedna, Eris, Ceres, etc. are still planets but they are a specific class of planets ("dwarf planets"). This is similar to the Sun being classifed as a "yellow dwarf" but it's still a star.

Now that I've got that off my chest, Pluto and Sedna are members of the Kuiper Belt, a collection of bodies that extend from about Neptune's orbit out to where the Oort Cloud is supposed to begin. The Kuiper Belt is approximately co-planar with the ecliptic but extends farther away from the central plane of the solar system. This definition allows Pluto, whose orbital inclination is significantly larger than average to be included in the Kuiper Belt.

Astronomers are consistently finding more members of the Kuiper Belt through photographic review. Most are smaller than Pluto, Sedna and Eris, some are similar in size and there is likely to be at least one more body that will be larger.

Answer 2

Pluto is no longer a plant and Sedna is a planet but might not be in the future. There are three qualifitications for being a plant 1.Has to be round 2.Has to orbit the Sun 3. Has to "clean" its orbit. Pluto doesnt have a strong enough gravity to pull debris in from its orbit and is now no considered a planet. As far as anyone know there still can be many more things out there. Our solar system extends to the Kiper Belt. Its a long ways off and there can be planets we never knew existed.

Answer 3

There are a number of large celestial bodies beyond Pluto. The area is known as The Oort cloud and contains drifting asteroids and planetoids of varying dimensions.

Answer 4

not in our milky way-but in many other solar systems yes.
and even astroroids in ours-not planets are.

pluto is not a planet anymore--but a drawf---