SUNSET: 
Distorted Galaxy Hints at the Nature of Dark Matter
Astronomers analyzed the gravitationally lensed image of a distant galaxy to test the nature of dark matter.
60-second Astro News: Magnified Galaxies Provide Window to Early Universe
Astronomers use cosmic magnifying lenses to peer into the universe's distant past.
From Starving Black Holes to Warped Galaxies
Hot topics from the American Astronomical Society summer meeting range from colliding galaxies, to warped galaxies, to starving black holes.
Hubble Images Reveal Dark Matter Problem
Astronomers studying Hubble Space Telescope images of massive galaxy clusters have uncovered a potential problem with dark matter.
Our Unexpectedly Smooth Universe May Point to New Physics
The latest data release from a survey of 31 million galaxies reveals that our universe is even smoother than we thought it was.
Incredible Resolution: Reconstructed Galaxy Pushes Hubble’s Limits
Thanks to the effects of gravitational lensing, a team of astronomers was able to reconstruct a distant galaxy and study its unexpectedly clumpy star forming regions.
Cosmic Lens Provides Unique View of Supernova
Astronomers have discovered a gravitationally lensed Type Ia supernova that will soon give them a new measure of the universe’s expansion.
Not-So-Clumpy Dark Matter Poses Cosmological Challenge
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.
Students Discover a Galactic Eye of Horus
Undergraduate students in Japan stumbled upon a rare lensing of two distinct background galaxies.
Mysteriously Bright Supernova Explained
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.