Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

A small red dwarf star is challenging our knowledge of how planets form by coexisting with a massive exoplanet, much like a ...

For the unversed, "Planet Nine" is a hypothetical planet which is reportedly larger than Earth that is thought to orbit ...

Scientists have discovered a giant planet called TOI-6894b, orbiting a star that should be far too small to have formed it.

Giant planets are not rare per se — after all, we have four in our own solar system. Such large worlds are, however, rarely ...

Astronomers have discovered a massive gas giant, TOI-6894b, orbiting the red dwarf star TOI-6894, a pairing that defies ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system ...