This hypothetical planet is provisionally known as Planet 9. Computer simulations show it must be a very large planet, consisting of between four and eight times the mass of the Earth and at least ten times the distance of Pluto.
Astronomers have released a catalog of 316 trans-Neptunian objects (TNOs) - minor planets located in the far reaches of the Solar System - detected from the first four years of the Dark Energy Survey.
Using the ALMA, astronomers have revealed extraordinary details about a recently discovered far-flung member of our Solar System, the planetary body 2014 UZ224, more informally known as DeeDee.
Using the Pan-STARRS telescope in Hawaii, astronomers detected a mysterious trans-Neptunian object (TNO) moving backwards around the sun.
