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.

Billions of years ago, in the frozen edges of the solar system, a violent impact shaped one of space’s oddest pairs. Instead ...

In 2005, thanks to Michael Brown’s scientific antics, Pluto was removed from the list of planets in the solar system. In 1968, the Apollo 8 mission flew around the moon. In 2001, Chris Hadfield became ...

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

Planet TOI-421b lacks the haze of other exoplanets, which means we're able to get a surprisingly clear understanding of it.

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

Macduff met the Herald this week at the Jupiter basalt marker along the Columbia Park Trail, just east of the blue bridge. It ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

A team of international scientists has identified a promising Planet Nine candidate by comparing infrared surveys of the sky ...

A 9th planet in our solar system might be found — and no, it’s not Pluto - Is there another planet out there? Researchers say ...

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