Cosmology is big-picture astronomy — the universe on its grandest scales. From the mysteries of dark matter and dark energy to the vast cosmic web, modern cosmology probes what makes the cosmos tick.

Here you’ll find Sky & Telescope’s coverage of the latest cosmology discoveries. Want to know about evidence for the Big Bang or hints of new physics? We bring you in-depth reports on the early universe, ancient galaxies, and the cosmic microwave background, the leftover radiation of the universe’s birth. As scientists peer farther back in time and space, we’ll be your guides on the quest to reach the cosmic dawn.

BICEP’s Big Bang Finding Reduced to Dust

Yes, it was too good to be true. The cosmic "discovery of the century" last March has officially blown up. Or will blow up next week when a new analysis of polarization in the cosmic microwave background is officially released. The excitement burst onto the world 10 months ago when the BICEP microwave background...

local supercluster

Laniakea: Our Home Supercluster

Astronomers have mapped the cosmic watershed and discovered a massive supercluster that extends more than 500 million light-years and contains 100,000 large galaxies. The Milky Way sits on the edge of this humongous structure.


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.


A New Galactic Yardstick

Astronomers have developed a new method to measure distances to bright but faraway galaxies, a tool which will help better constrain the expansion rate of the universe.

Dust in the Heart of Circinus

Infrared observations of the Circinus Galaxy may help reveal the shape of the dusty region fueling its active galactic nucleus and shed light on what governs dust structures in other galaxies.

B-mode discovery telescope

Direct Evidence of Big Bang Inflation

Researchers with an experiment based at the South Pole have discovered the long-sought "smoking gun" for inflation. The signal was hidden in polarization patterns in the cosmic microwave background and confirms physicists' audacious theory of how the Big Bang happened.

Hubble Displays Galactic Jellyfish

These stunning new images of spiral galaxy ESO 137-001 highlight its violent encounter with the intracluster plasma of Abell 3627, which is stripping away its gas and forming stars in the streamers.