In reporting on emerging science for 180 years, Scientific American has published straight accounts that were considered ...

Astronomers have long speculated about the existence of a mysterious planet lurking far beyond Neptune, a world several times ...

It’s always fun to test our knowledge with questions from our school days. Sure, we’ve grown up and learned a lot since then, ...

Prepare to get schooled If you have kids in school, or even if you don’t, you’ve probably realized that there’s a lot about the day-to-day of school that’s changed in recent years. Everything from the ...

Astronomers propose a giant, hidden planet beyond Neptune to explain odd orbits of distant Kuiper Belt objects.