This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

NASA has given its Perseverance Mars rover a powerful new ability to determine its exact location on the Red Planet without ...

Why do some places wait 1,000 years to see a total solar eclipse while others get two in a decade? The surprising orbital ...

Scientists think it's possible for a spacecraft to gain enough velocity to catch up with iconic interstellar comet 3I/ATLAS, which is currently speeding away from us, by firing its booster rockets ...