NASA has just made a groundbreaking discovery—a new planet beyond Neptune that wasn’t there before! This mysterious find could change how we understand our solar system and the universe itself. Is ...

A planet’s opposition occurs when Earth passes between it and the Sun. As a consequence of that geometry, Neptune’s disk ... but they don’t have to be large—any kind will do the trick ...

Kuiper Belt, well past the orbit of Neptune (artistic illustration ... of a distant Earth-mass planet would have profound implications for planetary science. “We would need to refine the ...