#SpaceSunday 🔬✨In the 1880s, the Harvard College Observatory began the world’s largest collection of photographic plates, some taken using the “Great Refractor,” the largest telescope in the U.S. at the…
#SpaceSunday 🔬✨In the 1880s, the Harvard College Observatory began the world’s largest collection of photographic plates, some taken using the “Great Refractor,” the largest telescope in the U.S. at the…