50 years ago, scientists had hints of a planet beyond Pluto

There have been suggestions that our solar system might have a tenth planet

In the April Publications of the Astronomical Society of the Pacific, a mathematician 

 presents what he says is “some very interesting evidence of a planet beyond Pluto

The 1972 evidence never yielded a planet, but astronomers haven’t stopped looking

 though it became a search for Planet 9 with Pluto’s 2006 switch to dwarf status.

 scientists hypothesized that the tug of a large planet 500 to 600 times as far from the sun as Earth 

Researchers using the Atacama C­osmology Telescope in Chile to scan nearly 90 percent

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