Does Planet 9 exist? Researchers make a breakthrough in their search

It is still considered a theory: But renowned US astronomers are convinced that there is a ninth planet in the solar system. Now they have found new clues on Planet 9.

Planet 9 is said to be extremely far from the sun: it takes 10,000 to 20,000 years to orbit it.

Foto: Caltech/R. Hurt (IPAC)

Suddenly Pluto was gone. In any case, he was no longer in the exclusive ranks of the nine planets orbiting the sun. Since August 24, 2006, Pluto is officially no longer a planet, just a dwarf planet. No more planet 9.

What is a planet

At that time, the International Astronomical Union (IAU) defined what a planet actually was. The predicate planet is only given to a celestial body, the