There is a hypothetical class of particles that always travel faster than light. Einstein himself played around with the idea, calling them “ meta-particles,” but today we call them tachyons, a word ...

Will it ever be possible for time travel to occur? – Alana C., age 12, Queens, New York. ... who had capabilities to travel back in time. But no one showed up. As he pointed out: ...

An Extraordinary Particle Could Travel Back in Time, Scientists Say. The potential is tantalizing. By Tim Newcomb Published: Feb 21, 2023 3:05 PM EST. 1. Xuanyu Han // Getty Images.

When you think about the idea of time travel, you likely think about the fantastic possibility of going backward in time to an event in the past, rather than our constant, inevitable march forward in ...

One major group in time-travel thought relies on multiple universes, meaning that decisions ripple into different versions of the universe.By traveling back in time, you simply approach a ...