Two studies fill in gaps about the cosmos’s ordinary matter. One maps it all, even the “missing matter.” The other details one of its hiding spots.

Gravitational waves stretch and squeeze the fabric of space and time itself. When space/time is squeezed, pulsar pulses ...

The Big Bang model begins with a point of infinite density where the laws of physics break down. This is a deep theoretical problem that suggests the beginning of the Universe is not fully understood, ...

"This work is a step toward understanding how quantum mechanics and gravity work together, a major unsolved problem in ...

Could the Universe have been born inside a black hole? This question, raised by a team of scientists, challenges the Big Bang ...

The scientists who precisely measure the position of Earth are in a bit of trouble. Their measurements are essential for the ...

Human beings have enjoyed a unique and lonely role among intelligences. Do other minds exist in life's other kingdoms? With ...

Supermassive black holes usually lurk unseen, but when an unlucky star drifts too close they ignite titanic outbursts ...