Until then, a team of researchers believes it has found the most compelling evidence yet that the hidden planet is real. The search for Planet Nine has only recently kicked into gear, but the ...

An curved arrow pointing right. Astronomers say they've discovered a ninth planet 200 times farther from the Sun than Earth. Produced by Emmanuel Ocbazghi. Original Reporting by Jessica Orwig.

Researchers have used various telescopes to comb the sky for signs of this elusive planet, but none have found definitive proof. That could change soon with the Vera C. Rubin Observatory ...