It's been 20 years since Pluto lost its status as the ninth planet of the solar system, but we still can't seem to let it go. Reading time 3 minutes Pluto remains one of the great generational divides ...

Pluto was downgraded from a planet to a dwarf planet in 2006 by the International Astronomical Union. The main reason for Pluto's demotion is that it's not able to "clear its orbit of debris." Other ...

Pluto, which stepped down from its place as the ninth planet in the solar system in 2006, is back at the center of debate. That is because the head of the National Aeronautics and Space Administration ...

A heartfelt letter written by a 10-year-old has reignited a long-running debate in astronomy, after it caught the attention of Nasa chief, who responded with a simple but encouraging message: "Kaela — ...