The (modern) Morgan–Keenan spectral classification system, with the temperature range of each star class shown above it, in kelvin. Image credit: Wikimedia Commons user LucasVB, additions by E. Siegel.
What to Eat According to Your Zodiac Sign || The zodiac, after all, is the world's oldest classification system. Just for fun, we asked our favorite amateur astrologer, Peter Smith, what the stars might say about the future of your shape.
Annie Jump Cannon was a female astronomer best known for coming up with the current system of stellar classification. She was one of the so-called Harvard computers who analyzed photographic plates of the stars.