CAPE CANAVERAL, Fla. (AP) — A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere that may have been created by volcanic eruptions or a comet strike. Just 300 miles (500 kilometers) or so across, this mini Pluto is thought to be the solar system’s smallest object yet with […]

A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere.