For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

James Webb Space Telescope observations suggest Pluto’s atmosphere is unlike any other in the solar system, confirming a 2017 ...

Pertussis infections have surged in recent months, and some people may need an additional shot for protection.

Last Month This Month is a recap of all the previous month's news, featuring headlines from Slog AM. Find it in every issue ...