A spacecraft traveling at 99 percent the speed of light toward Alpha Centauri would cross 4.3 light-years in what feels like months to its crew, while decades tick by on Earth. That asymmetry is not ...

A cluster of recent theoretical papers has laid out mathematical frameworks for propelling spacecraft at speeds ranging from a significant fraction of the speed of light to, in the most ambitious ...

In late 2020, physicist Harold “Sonny” White, PhD, research director of the nonprofit Limitless Space Institute, noticed something peculiar—and familiar—in a circular pattern of data plots generated ...

Life on the International Space Station may feel distant, but columnist Graham Lawton finds that studying how astronauts ...

If an alien in the Alpha Centauri star system were craving pizza, it would take tens of thousands of years to deliver it using today’s rocket technology. According to a press release, researchers at ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might ...