Readers, help me sort out an egregious detail of astronomical lore.
The most common method of classifying stars -- Harvard Spectral Classification -- was thought up by one of the most famous female astronomers of all time, Annie Jump Cannon. Adapted from a cumbersome older method which sorted stars into 22 alphabetical categories of observable hydrogen in their spectra, the Cannon method orders stars from hottest to coldest. This, despite being functional and elegant, left her (and us) with an unpronounceable acronym: OBAFGKM. With the recent addition of two colder categories of stars, the…
Advertisment
