This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Samantha Lawler, Assistant professor, Astronomy, ...

Cara Lucy O'Connor has a concern. Pluto used to be one of the nine planets in the solar system, and it isn't anymore. That's not right, said the little girl from Ireland. So Cara, with the help of her ...

WEBVTT TAKING ON THE GIANTS. HOPEFULLY THEY WIN. IT’S BEEN A LITTLE OVER A DECADE SINCE PLUTO WAS DOWNGRADED FROM A PLANET TO A DWARF PLANET. THIS MORNING, I’M JOINED BY CHILDREN’S BOOK AUTHOR STEF ...