Gravitational lensing

Cosmology

Hubble Sheds Light on Dark Matter and Cosmic Expansion

The Hubble Space Telescope, which will celebrate its 30th birthday this April, has images cosmic mirages that yield two remarkable cosmological results.

Cosmology

Dark Energy Survey Releases First Three Years of Data

Results from the first data release of the Dark Energy Survey include eleven new stellar streams in the Milky Way galaxy.

Experiment set-up

Cosmology

Is Dark Energy a Chameleon?

A lab experiment has all but nixed one of the theories of dark energy, a mysterious force pushing the universe apart.

Science-based Q&A

The Kavli Foundation Q&A: Dwarf Galaxies and the Quest for Dark Matter

Satellite dwarf galaxies orbiting the Milky Way should help scientists better grasp the universe's evolution while also homing in on dark matter's identity.

Illustris simulation's view of the universe

Cosmology

Best Model Yet for Cosmic Evolution

Astronomers have created the most realistic computer simulation of the universe’s evolution to date, tracking activity across 13 billion years of cosmic history.

Cosmology

Quasars Track Expanding Universe

The most precise measurement yet of the Hubble parameter illuminates dark energy — the elusive entity that’s accelerating the universe’s expansion.