Proof of parallel universes radically different from our own may still lie beyond the domain of science
Astronomers have discovered two supermassive black holes locked in a whirling dance at the center of the nearest quasar galaxy
Black holes may be bubbles devoid of space and time—and encased in “firewalls” that confound both general relativity and quantum mechanics
Is the big bang, and all that came from it, a holographic mirage from another dimension?
The invisible dark matter particles that dominate the universe may come in strange and varied forms
Dozens of particles from halfway across the universe have landed in the IceCube experiment. These messengers could help answer some long-standing cosmic conundrums
The cosmic neutrino background could provide more details about the universe as it once was
Newly discovered lobes stretch tens of thousands of light-years above and below the Milky Way's disk. Where did they come from?
Old grudges between three teams of astronomers have threatened the survival of ground-based astronomy's boldest, biggest projects
Emerging evidence suggests that the first starlight to shine after the big bang’s flash came from distant suns that ranged from very large to incredibly huge
Astronauts already skip ahead in time, but the laws of physics seem to forbid going backward—or do they?
The Dark Energy Survey is examining distant galaxies to figure out why space is expanding at an ever faster pace
No other agency or company had previously successfully landed a reusable rocket
On the centennial of the theory of general relativity, senior Fermilab scientist Don Lincoln reflects on Einstein's quest to understand the quantum world
A collision between the Red Planet and its innermost moon, Phobos, could create a Saturn-like field of debris
A dozen quasars in the early universe appear to have shut down in just a few years, baffling astronomers
Water from sources such as aquifers could last long enough to pool, with larger pools remaining liquid for at least a year, according to researchers
Findings from NASA’s Cassini spacecraft suggests winter in Titan's southern hemisphere will be even colder than predicted
Beamed power could create a low-cost paradigm for access to space