Astrum explores everything NASA's New Horizons saw and discovered in the Kuiper Belt around Pluto, Charon and Arrokoth (Ultima Thule).

Today, NASA's New Horizons team - which sent the first spacecraft in history to fly over Pluto last week - revealed the latest set of Pluto images that came with some big surprsies and new mysteries.

Pluto is probably best known for being a demoted planet. In 2006, the International Astronomical Union stripped it of its original classification, after narrowing the definition of a planet to be ...

Pluto is too far away from Earth to be seen with the naked eye. If you stood on Pluto's surface, the Sun would merely appear to be a very bright star. Although previous images showed that ...

At this very moment, NASA's New Horizons spacecraft is more than 3 billion miles from Earth. To put that into perspective, think about how mind-numbingly far the Sun is from Earth. Then multiply ...

FLAGSTAFF, Az. – Whether Pluto is officially a planet is the least interesting thing about the runt of the solar system, astronomers will tell you 95 years after the discovery of the fascinating ...

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...