Our analysis reveals two possible Planet Nine candidates whose positions and flux are within the theoretical prediction ranges. These candidates warrant further investigation through follow-up ...

Earth's newest telescope could discover Planet 9—and solve other huge mysteries No telescope has basked in the night sky quite like the enormous new Vera Rubin Observatory.

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A newly found object could be a dwarf planet that contradicts the Planet Nine hypothesis.

For years, astronomers have been searching for a ninth planet in our solar system (after giving Pluto the old heave-ho and demoting it to a dwarf planet) and now researchers say they’ve found a ...

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And long range is, honestly, underselling it—top theories for the positioning of Planet 9 place it around 400 astronomical units (AU). The furthest known planet, Neptune, is only about 31 AU.

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say.

An object seen to have moved in the time between when it was imaged by the IRAS and AKARI surveys in 1983 and 2006 respectively could be Planet Nine.

If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

For decades, we believed there were nine planets in our solar system—until Pluto was reclassified in 2006. But what if there’s another planet, five times the size of Earth, lurking in the ...