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Astronomers Search For Giant Planet On Outer Edges Of Solar System

By Joe Palca
Published September 25, 2017 at 4:31 PM EDT
An artist's depiction of Planet Nine. The object is thought to be gaseous, similar to Uranus and Neptune. Hypothetical lightning lights up the night side.
Caltech/R. Hurt (IPAC)
An artist's depiction of Planet Nine. The object is thought to be gaseous, similar to Uranus and Neptune. Hypothetical lightning lights up the night side.

Copyright 2017 NPR
Joe Palca
Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.
See stories by Joe Palca
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