The New Horizons mission would forever change the way we think about this little world. But in the same year that New Horizons was launched, the International Astronomical Union voted to reclassify Pluto as a dwarf planet. What exactly prompted this demotion of Pluto?
When Pluto was discovered in 1930, it was immediately accepted as the ninth planet. Seventy-six years later, the International Astronomical Union decided that Pluto should no longer be considered a planet, and reclassified it as a “dwarf planet.” What motivated this reclassification? And how exactly is a planet defined? Regardless of how we choose to classify it, Pluto is a wonderful creation and one that does not fit the secular narrative. The discovery and early investigation of this dwarf planet is a fascinating part of history.
The outermost planet of our solar system is a world of wonder and mystery. Neptune is a virtual twin to Uranus, similar in size and color. But its differences are fascinating and challenge secular thinking.
Saturn has 82 known moons – more than any other planet at the publication time of this article. Of these, twenty were discovered in the last year. Most are just a few miles across. But the larger ones are some of the most fascinating moons of the solar system.