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Astronomers Search For Giant Planet On Outer Edges Of Solar System

NPR | 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.
See stories by Joe Palca