Tachyons, faster-than-light particles, challenge Einstein's theory, hinting at time travel. New models suggest they may reshape physics, causality, and cosmic expansion.

A theoretical particle that travels faster than light, the tachyon has long intrigued physicists and fueled decades of speculation. Initially conceived as a possible solution to quantum and relativity ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...

Euclid space telescope sent some images back to Earth during an early testing phase. While reviewing the pictures, astronomer ...

The theory is a series of equations defined by Einstein. These equations combine space and time to create space-time. Gravity is explained by these equations, which are consistent with what we see ...

Euclid’s jaw-dropping capture of the closest Einstein ring ever seen reveals the hidden forces shaping our universe — and ...