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Mon May 10, 2021 ANNIE CANNON’S OBAFGKM 99 years ago, on May 9th, 1922, astronomers formally adopted Annie Jump Cannon’s stellar classification system. Annie Cannon worked at the Harvard Observatory, where she sorted and catalogued stars by their spectra. When you look at the light of a star through a specialized prism, a spectroscope, you can see that within the rainbow spectrum of the star’s light there are thin gaps where the color is missing. These gaps result when the outer atmospheres of those stars absorb the light, and the spacing of the gaps can be matched up with similar lines made by gases on earth, which tells us what elements are present in those far-away stars – kind of a cosmic bar code. Cannon sorted the stars, and after some adjustments that had to be made because of things like high temperature ionization, resulted in a ranking of stars from hot to cool: O, B, A, F, G, K and M, which countless astronomy students have memorized by using this simple phr ....
40F Never Felt So Nice! Signs of Spring Outdoor hockey rinks might look a little sloppy out there today as the mercury climbs to near 40 degrees once again. Don t be surprised if you see a few rain drops mixed with snowflakes later today. Check the blog for more details. -Todd Nelson
By Todd Nelson Text size Copy shortlink: Quick Tuesday Clipper Here s the weather outlook from AM Tuesday to AM Thursday, which shows a quick moving clipper diving through the region late Tuesday into early AM Wednesday. This system will be responsible for a burst of narrow snowfall across the northern half of the state. The Twin Cities could see a little light rain/snow as this system slides through, but the bulk should fall north of the metro. ....