The two keys to Edwin Hubble's breakthrough discovery were forged by others in the 1910s. The first key, the period-luminosity scale discovered by Henrietta Leavitt, allowed astronomers to calculate ...

A mysterious object, 31/Atlas, is hurtling towards Earth, sparking debate among scientists. Harvard astrophysicists, led by Avi Loeb, speculate it could be extra-terrestrial technology due to its ...