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 ...
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 ...
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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