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Shadows in the Big Bang Afterglow Reveal Invisible Cosmic Structures
Cosmologists are using secondary signatures from the cosmic microwave background to map the universe’s hidden matter.
Laws of Logic Lead to New Restrictions on the Big Bang
Physicists are translating commonsense principles into strict mathematical constraints on how our universe must have behaved at the beginning of time.
How the Cosmic Dark Ages Snuffed Out All Light
The recent discovery of some of the first galaxies in the universe illuminates the darkest era in cosmic history.
How Ancient Light Reveals the Universe’s Contents
A photograph of the infant cosmos reveals the precise amounts of dark matter and dark energy in the universe, leaving precious little room for argument.
What Shape Is the Universe? A New Study Suggests We’ve Got It All Wrong
Most every cosmologist believes the universe is flat. A new analysis argues that it’s closed.
A Short History of the Missing Universe
Astronomers have known where the universe’s missing matter has been hiding for the past 20 years. So why did it take so long to find it?
The Last of the Universe’s Ordinary Matter Has Been Found
For decades, astronomers weren’t able to find all of the atomic matter in the universe. A series of recent papers has revealed where it’s been hiding.
Multiverse Collisions May Dot the Sky
Early in cosmic history, our universe may have bumped into another — a primordial clash that could have left traces in the Big Bang’s afterglow.
A Bold Critic of the Big Bang’s ‘Smoking Gun’
The cosmologist David Spergel explains why a widely publicized gravitational-wave discovery could be wrong, and how the “overreaching” study could affect the public’s perception of science.