While telescopes point up at the sky and scan the recesses of space, probes like Voyager 1 are traveling incredible distances ...

At a frigid -125 degrees Fahrenheit (-87 degrees Celsius), WD 1856+534 b is the coldest planet ever directly observed, ...

The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. In 1983 ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in our solar system. However, as with all ninth planet research, the new ...