Very special quasi planets.

A new finding calls into question an old astronomical rule that had been in place since the 19th century. Qoaoar is a dwarf planet candidate that orbits the sun well beyond Neptune and Pluto, it is about 1,110 kilometers in diameter, the surface is moderately red and signs of water ice have been found on it, which suggests that it could be producing in cryovolcanism, that is, volcanoes that spew ice instead of lava, a small amount of methane has also been detected, it also has a moon called Weywot about 74 kilometers in diameter.

Some astronomers suspect that the moon could be a fragment of Qoaoar resulting from a collision, so far what we know about this dwarf planet candidate, what they have now found is that Qoaoar has rings, it is not the first case of a dwarf planet or a minor planet with rings, there are rings around Chariklo, which is a centaur, which is the name given to a type of asteroid made up of a large amount of ice and which orbits between Jupiter and Saturn. Chariklo is about 300 kilometers in diameter.

Another one that has rings is Haumea, which is officially a dwarf planet, but a very rare dwarf planet since it is shaped like a rugby ball, with a diameter of 1,900 kilometers long and a width of 1,300 km.

But the newly discovered Qoaoar ring is very special, because it breaks with the Roche limit, a rule calculated by the French astronomer Édouard Roche 175 years ago and which allows us to know the minimum distance that an object orbiting a massive body can withstand, maintaining its structure by its own gravity without beginning to break and disintegrate due to the tidal forces generated by the larger body.

The Rings known to date are at that limit, beyond the limit the materials are not crushed by tidal forces and merge into a larger body; think, for example, of the collision that During the early days of the solar system occurred between the Earth and a planet the size of Mars, temporarily the debris from the collision formed a ring around the earth, but all the material that was off-limits of roche ended up merging to create our moon.

In this case that is news, astronomers cannot explain how Qoaoar has a ring far beyond its Roche limit, according to their calculations all that material should have merged into a moon, in just a few decades, but the existence of the ring shows that Roche's limit rule fails.

Something strange is happening in Qoaoar, this small world is between 41 and 44 times farther from the Sun than the land is from the Sun, so experts suspect that the cold could be one of the factors that will explain the existence of this strange ring, but they don't know for sure, we have to investigate more and explore other dwarf planets, maybe it will turn out that having rings is something more common in the universe than we think and that breaking the rules is also something more common in the universe of what we think.

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