Scientists agreed the rocky outcrops in a remote part of Quebec, Canada, were ancient. But were they really Earth’s oldest?

The Vera C. Rubin Observatory is expected to find millions of unknown objects in our solar system, and perhaps even a ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

With 3.2 billion pixels and a decade-long search, the Rubin Observatory will reveal what’s been hiding in plain sight.

Jupiter is the largest planet in the solar system and the fifth planet out from the sun, orbiting the sun at a distance of 5.2 astronomical units (1AU equals the average distance from Earth to sun ...

The second half of the 19th century was a particularly interesting time to imagine Mars. This was a period during which the ...

Scientists at Rice University believe there’s a 40% chance that a mysterious ninth planet — Planet Nine — could be orbiting far beyond Neptune and Pluto in the icy Kuiper Belt. This potential ...