On February 18, 1930, the American astronomer Clyde Tombaugh discovered Pluto! Before he discovered Pluto, another astronomer ...

It would be understandable if you stopped thinking as much about Pluto after it was “demoted” from being considered one of the nine planets sharing the Earth’s solar system to being classified as a ...

Since Pluto remains in the sun’s orbit, it should be considered a planet due to the fact that it is still a part of the solar system. And since Pluto is still hanging on at the end of the system, it ...

Mercury is the smallest planet in our solar system. Explore its size, extreme temperatures, core structure, and comparison with Pluto.

We classified Pluto before really understanding it—just like we reduce people to job titles or put names on relationships ...

Every winter, skiers chase smooth carving turns, reliable snow and that dream run. As the Milano Cortina Winter Olympics 2026 unfold on Earth, it raises a fun question: if the Games ever leave our ...

Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...

Pluto was considered the ninth planet for 76 years after its discovery in 1930. Then in 2006, the International Astronomical Union redefined what counts as a planet. Pluto failed one key rule — ...

As next-generation telescopes map this outer frontier, astronomers are bracing for discoveries that could reveal hidden planets, strange structures, and clues to the solar system’s chaotic youth.

Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that ...

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.