Astronomy Tonight for - 02-13-2025

On February 13th in astronomical history, one of the most significant events occurred in 2008. On this date, the International Astronomical Union (IAU) officially named two of Pluto's moons: Nix and Hydra. Now, you might be thinking, "Pluto? Isn't that the planet that got demoted?" Well, yes and no. Pluto was reclassified as a dwarf planet in 2006, but that doesn't make it any less fascinating! In fact, the naming of these moons added even more intrigue to the Pluto system. Nix and Hydra joined Charon, Pluto's largest moon, which was discovered in 1978. The discovery of these two moons actually happened in 2005, but it took until 2008 for them to receive their official names. Talk about a long wait for a celestial christening! Nix was named after the Greek goddess of darkness and night, which is quite fitting for a moon orbiting in the dim outer reaches of our solar system. Hydra, on the other hand, was named after the nine-headed serpent from Greek mythology. Perhaps the astronomers were hinting at the complexity of Pluto's system with that choice! Interestingly, the first letters of the names Nix and Hydra (N and H) were chosen as a nod to NASA's New Horizons mission, which was en route to Pluto at the time. It's like a cosmic inside joke! This naming event sparked renewed interest in Pluto and its moons, leading to further discoveries. In fact, two more moons, Kerberos and Styx, were discovered in 2011 and 2012 respectively, bringing Pluto's total moon count to five. So, the next time you're stargazing on a February 13th, take a moment to think about Nix and Hydra, the little moons that could, spinning around a dwarf planet billions of miles away. They may be small, but they certainly made a big impact on our understanding of the outer solar system!