Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

The trans-Neptunian object Altjira, 44 times farther from the Sun than Earth is, could be the second known trinary, ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

A group of comets with unexplained movements presents a quandary D avide Farnocchia hunts down and tracks asteroids, and ...

Using data collected by the spacecraft’s LEISA spectral imager, researchers are uncovering the true nature of Nix’s surface coarse, pure water ice that behaves like rock due to the extreme cold of ...

Pluto Has the Biggest Heart in the Solar System It was only after images from 2015 arrived that Pluto secured a place in my heart. That's because Pluto, it turns out, has a heart bigger than mine ...

Astronomers have long suspected that an enormous, unseen planet is hiding somewhere far beyond Neptune, quietly shaping the ...

Venus may be far more geologically alive than anyone expected. New research suggests its outer crust could be churning with ...

No explosive birth needed: The discovery suggests this black hole likely formed through direct collapse, a quiet implosion ...

Carolyn Porco was 13 years old when she experienced her first 'cosmic connection.' She was on a rooftop in the Bronx, of all the unlikely places, peering through a friend's telescope when she caught ...

But perhaps an even more intriguing target is Pluto, the frozen dwarf planet at the outer reaches of the solar system. Images from the New Horizons mission revealed remarkable polygonal patterns on ...

Venus, the hottest planet in the solar system, is estimated to have 85,000 volcanoes, based on radar images from NASA's ... mission on the dwarf planet Pluto, which exhibits polygonal surface ...