New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

New James Webb Space Telescope data reveal Pluto's high-altitude haze is a key driver of the climate on the dwarf planet, offering clues to Earth's ancient atmosphere.

Pluto’s mysterious far side may conceal towering ice formations, according to research offering clues about the dwarf ...

The space probe began making discoveries even before today's flyby. — -- Three billion miles and nearly ten years of travel led up to the moment NASA's New Horizons probe zoomed past Pluto ...

We still don't know for sure if there's a ninth planet in our solar system, but a new discovery could help to prove that Planet Nine doesn't exist.

Today, the dwarf planet Pluto orbits the sun from the edge of our solar system and its surface temperature is an inhospitable negative 378 to negative 396 degrees Fahrenheit. But a new study ...

Ultimately, they identified 2017 OF 201 in 19 different exposures, captured over 7 years. The discovery has significant implications for our understanding of the outer solar system.

A newly discovered dwarf planet called 'Ammonite' (2023 KQ14) has been spotted in the outer solar system, and it could be ...