kuiper-belt

A Science Advances study using Webb data finds Nereid's icy composition rules out a Kuiper Belt origin, making it the sole intact remnant of Neptune's primordial moon system.

A 500-kilometer plutino in the Kuiper Belt shows refractive signs of a 100-200 nanobar atmosphere, a discovery published May 4 in Nature Astronomy that astronomers say challenges models of which small icy worlds can hold gas.