Ninety years ago today, Clyde Tombaugh, a young astronomer working at Lowell Observatory in Flagstaff, Arizona, discovered Pluto. In doing so he unknowingly opened the door to the vast “third zone” of ...

Why are there moons at the edge of the solar system that cause their rotation axes to fluctuate as if ignoring the laws of ...

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical Union (IAU) redefined what constitutes a planet, leading to Pluto’s ...

After traveling for nearly 10 years, NASA’s New Horizons spacecraft is finally set to fly past Pluto on July 14 in humankind’s first close encounter with the dwarf planet. But the spacecraft is at ...

Twenty years after Pluto became a dwarf planet, people are still fighting over its status. Experts explain why the debate feels so personal.

Madrid, Jun 4 (EFE).Madrid, Jun 4 (EFE). — Just weeks before NASA’s New Horizons probe flies by Pluto, a study of images captured by the Hubble Space Telescope has yielded new knowledge about the ...

After travelling for nearly 10 years, NASA's New Horizons spacecraft is finally set to fly past Pluto in humankind's first close encounter with the dwarf planet. But the spacecraft is at least a ...