Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for being a planet, putting Pluto into the new category of dwarf planet ...
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 ...
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 — ...
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