This is their dynamic. If the planet they’re looking for exists, it is likely six times the mass of Earth, with an atmosphere made of hydrogen and helium covering its rock-and-ice core. What makes it hard to find is its likely location: at least 400 times further away from the sun than our own planet, and 15 to 20 times further out than Pluto.
They know that Planet Nine is somewhere in between the constellation Orion and Taurus, but that’s about as exact as they can get, and they’ll need good weather to locate it. Right now the last predicted forecast showed fog. Even at six times the mass of earth, Planet Nine is so far away that it would appear as a barely visible point of light, even through the lens of the most powerful telescope they could get their hands on.