Special relativity

Space Interstellar travel faces steep hurdles, but recent research is paving a new path to the stars

Laser-sail experiments test a route to nearby stars, while research reveals major barriers to interstellar missions.

Space Cosmic gamma rays test the limits of Einstein’s speed of light rule Joseph Shavit

Space A beam of light can cross the entire universe in no time at all Joseph Shavit

Space New tachyon theory could unlock the secrets of time travel and causality Joshua Shavit

Space Physicists propose that our universe may contain three dimensions of time Joshua Shavit

Space Distance in space is an illusion Joseph Shavit