Black hole growth is slowing down in the universe. New research could help explain why.
Black hole growth is slowing down, suggests a team of astrophysicists who looked back in time across the universe's 13.8 billion-year history.
NASA ESA and D. Coe J. Anderson and R. van der Marel STScI
32 strange places scientists are looking for aliens
From planets and moons in our solar system to dying stars and parallel universes, here are some of the far-out places scientists are searching for alien life.