Interstellar space is unforgivingly vast, but the emptiness has some advantages. The lack of atmosphere means there is no aerodynamic drag. So when the ship reaches its cruise spe ...

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 ...

A leading British astrophysicist has argued that intelligent alien civilisations 'absolutely' exist somewhere in the cosmos ...