The allowable wavelengths for interstellar quantum communications. For a given distance away (left vertical axis), quantum communications are impossible where the horizontal distance line passes ...

Voyager 1, the most distant human object that is now flying through interstellar space, had thruster issues making it difficult for the spacecraft to stay pointed at Earth when calling home.

Here is his plan to find it. For more than 70 years, scientists have sought evidence of intelligent aliens by hunting for radio signals — interstellar messages beamed billions of miles across space.

In the 2014 film Interstellar, humanity takes advantage of a wormhole near Saturn to travel to different galaxies in minutes while searching for a new, habitable planet. Similarly, a network of ...