A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

Astronomers have long suspected that an enormous, unseen planet is hiding somewhere far beyond Neptune, quietly shaping the ...

But some astronomers suspect that at the edge of our solar system there is another large planet, and they call it Planet 9. NPR's Nell Greenfieldboyce reports that astronomers have been hunting ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar... If Planet Nine is out there, this telescope ...

But no one has actually spotted Planet 9. It's so far away ... was messing with the orbits of some small solar system bodies. "Vera Rubin is our best bet to find it in the next few years, probably ...