When a hunk of ice from another star system hurtles through our cosmic neighborhood, astronomers pay attention. When that ...

(cokada/iStock/Getty Images) Alien megastructures built to harvest stellar energy or alter the orbits of stars may be ...

Many fans of Resident Alien feel that the show was cut down in its prime, but strong streaming numbers make the best case for ...

In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.