To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.

Actual science finds itself badly outnumbered by entertainment repackaged as factual. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. This ...

A physicist has argued that fundamental cosmic constraints make visits from alien civilizations to Earth effectively impossible. Factors such as vast interstellar distances, the speed of light as a ...

For decades, the United States has been at the center of the global UFO debate, with more sightings reported within its borders than anywhere else in the world. According to the National UFO Reporting ...

The universe is vast and teeming with stars – but if intelligent life exists, it may not be able to visit Earth. By Kai James / The Conversation Published May 27, 2026 8:00 AM EDT This article was ...