Astronomers have discovered 3I/ATLAS, a massive interstellar comet speeding through our solar system. Harvard astrophysicist Avi Loeb says “it’s a possibility” that it could be an alien ship.

An international team led by the University of Geneva (UNIGE), including scientists from the National Centre of Competence in Research PlanetS, the University of Warwick, and the Canary Islands ...