50 Years Ago Space

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

Excerpt from the May 6, 1972 issue of Science News

a photo of the Atacama Cosmology Telescope scanning the night sky with the Milky Way overhead

Astronomers have used the Atacama Cosmology Telescope in Chile to scan nearly 90 percent of the Southern Hemisphere’s sky in search of Planet Nine.

Jon Ward/University of Pennsylvania

By Erin Garcia de Jesús

- More than 2 years ago

cover of the May 6, 1972 issue of Science News

Cometary evidence of a planet beyond Pluto — Science News, May 6, 1972

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