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Week 23


Special Topic: The K-T Event

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MAY 31, 2020: Comet ATLAS C/2019 Y4 will pass through perihelion at a heliocentric distance of 0.25 AU. A previous “Comet of the Week,” Comet ATLAS initially showed potential for becoming a bright object, but it now appears to have all but disintegrated as it has approached perihelion. It is traveling in the same orbit …

C/1998 K10’s Perihelion: 1998 June 1.88, q = 0.006 AU C/1998 K11’s Perihelion: 1998 June 2.06, q = 0.005 AU  Various previous “Ice and Stone 2020” presentations have discussed the impact that the joint NASA/ESA SOlar and Heliospheric Observatory (SOHO) mission – and in particular the onboard LASCO C2 and C3 coronagraphs – has had …

For many people, one of the most fascinating periods of Earth’s natural history is the Mesozoic Era, which spanned from roughly 252 million years ago to 66 million years ago. This period of time is often called the “Age of Dinosaurs,” and indeed these large reptiles were the dominant animals on Earth for well over …