When the solar system was first organizing itself, a disk of gas and dust took shape around the sun's central mass. It eventually sorted itself into the system of planets we see today. But there are ...

Generations of scientists have tried to explain how the solar system began. None of the explanations is wholly adequate. The trouble is that the solar system is not a haphazard collection of planets ...

Scientists may have finally revealed the history of the tantalizing TRAPPIST-1 system, an intricate collection of seven worlds that sit about 40 light-years away from us. These worlds, many ...