Could aliens ever visit Earth? An aerospace scientist unpacks the challenges of interstellar spaceflight.

The universe is vast and teeming with stars – but if intelligent life exists, it may not be able to visit Earth.

When aliens come visiting... AI robots, not real beings, will threaten our existence, scientist says

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 ...

Are aliens true or fake? Top astrophysicist explains why government UFO cover-ups are 'total nonsense'

A leading British astrophysicist has argued that intelligent alien civilisations 'absolutely' exist somewhere in the cosmos but insists there is no evidence they have ever visited Earth, dismissing ...