Astronomers have discovered a gravitationally lensed Type Ia supernova that will soon give them a new measure of the universe’s expansion.
In 2010, a mysteriously bright supernova appeared, later sparking a debate within the astronomy community. But new images of the now-faded supernova reveal an intervening — and until now invisible — cosmic lens, which magnified its light.
Astronomers analyzing a new sky survey have found that the distribution of dark matter in the modern universe is smoother than predicted from observations of a far younger universe.
Undergraduate students in Japan stumbled upon a rare lensing of two distinct background galaxies.