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hey guys! :D
Transneptunian objects are objects behind the orbit of Neptune. The biggest TNO is Pluto.
Why isn't Pluto a planet?
For an object to be classified as a planet, it has to orbit a star and clear up the space around it of debris. Pluto is orbiting a star, but it's much smaller than any other planet and is surrounded by many similar objects in the Kuiper belt.
We call objects like Pluto dwarf planets. There are 5 dwarf planets in our solar system, 4 of them being plutoids - plutoids are dwarf planets behind the orbit of Neptune.
The dwarf planets are Ceres (behind the orbit of Mars), Pluto, Haumea, Makemake, and Eris.
Pluto has 5 natural satellites - Charon, Hydra, Nix, Kerberos, and Styx
Moons like Triton or Pheobe were probably captured from the Kuiper belt.
Behind the Kuiper belt is the Oort cloud - it's a spherical region, probably the remnant of the original nebula
Many comets come from the Oort cloud - comets can have their orbits disturbed by the gravitational field of the gas giants, or other stars in the Milky Way. Then they are sent towards the Sun in elliptical orbits.
Because comets originate far away from the Sun, they are mainly made of ice. As they come closer to the Sun, they start to evaporate - this evaporated water and dust is pushed by the solar wind and creates the tail of the comet. These tails can be a whole AU long. Comets always evaporate when they go toward the Sun and then freeze again when they go away.
Other than the Kuiper belt, there is the asteroid belt, which lies in between the orbits of Mars and Jupiter.
The dwarf planet Ceres originates from there - it couldn't have become a planet because of the gravitational field of Jupiter.
On the orbit of Jupiter are two patches of asteroids called Trojan asteroids - they orbit at the same speed as Jupiter, therefore they can't collide with each other.
that's abt it! feel free to correct me or add anything!
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