Somebody told your friend that if an antimatter alien ever set foot upon the Earth the whole world would explode into pure radiant energy?

Answer 1

This has some truth in it. When antimatter and matter collide, they change into energy, so the world could in theory be destroyed. Antimatter-matter collisions produce huge amounts of energy.

Answer 2

That statement is not scientifically accurate. While antimatter does have the potential to release a large amount of energy upon contact with matter, it would not cause the entire world to explode. Such an event is purely speculative and not based on any scientific evidence.