The scientific wonderers at What If imagine the confusion of an advanced alien race finding the ruins of our cities buried under a million years of dust.

Trump has ordered a UFO data release. But if aliens exist, what would they think of us? - For generations, human beings have ...

In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

For nearly five decades, Steven Spielberg has helped define what alien stories mean to movie audiences. Sometimes they arrive as cosmic miracles. Sometimes as existential threats. Sometimes as ...

Assuming intelligent aliens know how to harvest energy from stars, would humanity be able to spot these high-level structures? Reading time 3 minutes Assuming aliens do physics like us but are ...

The following is an extract from our Lost in Space-Time newsletter. Each month, we dive into fascinating ideas from around the universe. You can sign up for Lost in Space-Time here. Modern physics ...