**Clyde Tombaugh's Discovery of Pluto: A Cosmic Milestone**

# This is your Astronomy Tonight podcast. Good evening, stargazers! I'm thrilled to tell you about a remarkable celestial event that occurred on February 18th—and buckle up, because this one is absolutely spectacular! On February 18, 1930, the American astronomer **Clyde Tombaugh made one of the most profound discoveries in astronomical history: he found Pluto!** Now, I know what you're thinking—"But wait, didn't Pluto get demoted?"—and yes, that's true. But let me tell you, on this winter's day nearly a century ago, this tiny world was the crown jewel of our solar system. Tombaugh was systematically photographing the night sky from the Lowell Observatory in Flagstaff, Arizona, searching for the mysterious "Planet X" that astronomers had predicted might exist beyond Neptune. Using a blink comparator—essentially a device that let him flip between two photographic plates—he spotted a faint point of light that had moved between exposures. After weeks of verification, the scientific world erupted. We had our ninth planet! What makes this even more delightful is that Pluto's name was actually suggested by an 11-year-old schoolgirl from Oxford, England, named Venetia Burney. She thought the Roman god of the underworld was a fitting name for such a distant, dark world. The astronomical community agreed, and the name stuck for 76 years! Of course, in 2006, the International Astronomical Union reclassified Pluto as a "dwarf planet"—but that discovery on this very date remains one of humanity's greatest moments of cosmic exploration. **Thank you so much for listening to the Astronomy Tonight podcast!** If you'd like more fascinating details about Pluto, Clyde Tombaugh, or any other astronomical wonders, please head over to **Quiet Please dot AI**. And please, **subscribe to the Astronomy Tonight podcast** so you never miss another cosmic story. Thanks for tuning in to another Quiet Please Production!