Something strange is happening on the outskirts of our Solar System. It could be a large, mysterious planet. Or, it could be ...

Our latest known interstellar visitor, comet 3I/ATLAS, is currently making its way out of the solar system, after passing by ...

Unlike conventional solar systems, which are hampered by the sun’s fluctuations and require backup systems to even them out, ...

Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents ...

A rare meteorite has revealed evidence of a massive lost world that once orbited the young Sun before being destroyed in a catastrophic collision. The discovery suggests some early planets formed from ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. The size of the solar system is defined by the volume ...

Exactly where the comet 3I/ATLAS came from within the Milky Way remains a mystery.

Forbes contributors publish independent expert analyses and insights. Dianne Plummer is an Energy Consultant and Certified Energy Manager. Rooftop solar has become one of the fastest-growing clean ...

Portal’s heat exchanger thruster, known as Flare, fires up during a test in a vacuum chamber. (Portal Space Systems Photo) Bothell, Wash.-based Portal Space Systems says it has successfully tested its ...