There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

One set of dots had matching colors and brightness ... there is solid evidence that the solar system's planetary census is incomplete." No observational evidence for Planet Nine has been found ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

Symphony San Jose ’s program, which people can experience on Saturday, May 10, 2025, at 7:30 p.m. and Sunday, May 11, at 2:30 ...

For over a century, astronomers have wondered if there's an extra planet in our Solar System that we haven't been able to see ...

NASA’s Lucy spacecraft captures asteroid Donaldjohanson, marking a new step in its mission to explore the solar system’s ...