Scientists have unlocked one of the solar system’s many secrets from an unexpected source: a planetarium show opening to the public on Monday. At the American Museum of Natural History last fall ...

An accidental discovery in an astronomy show offers researchers a new clue about the mysterious Oort Cloud, a large expanse of icy bodies revolving around the sun.

Temperatures there reach an astonishing 30,000-50,000 kelvin. There are a few ways you could define the edge of the Solar System – for instance, where the planets end, or at the Oort cloud, the ...