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

Some people look so unusual, it’s as if they don’t quite belong to Earth. Whether it’s their striking features, extraordinary proportions, or simply the way they carry themselves, they stand out in ...

Harvard professor Avi Loeb believes that aliens are not going to visit Earth in physical form, and would instead send a "technological device guided by AI". Their visit would not be fun either, and ...