What are the limits of our universe?
The universe may be infinite, but there are boundaries we will never be able to cross and places we will never reach, even if we moved at the speed of light
/cloudfront-eu-central-1.images.arcpublishing.com/prisa/COO7SHQ36BAJDFJXQXAFES6P2A.jpg)
The search for extraterrestrial life forms: Will we ever be able to confirm their existence?
Every so often, news breaks about the discovery of an unexplained alien object, but the claims never hold up to intense scientific scrutiny. The quest goes on regardless
newsletter
Sign up to EL PAÍS in English Edition bulletin