Harvard's Avi Loeb warns interstellar comet 3I/ATLAS could be alien tech. Experts weigh in on planetary defence and the risks ...

How could we defend Earth against an alien Invasion? Do we even stand a chance? Could the United States, Russia and China ...

A Harvard University astrophysicist has sparked a furious debate by warning he cannot rule out that extraterrestrials are ...

From the creators of XCOM's Long War mod, Terra Invicta bridges the gap between civilization on Earth and the vast interstellar empires of other space strategy games.