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July 10, 2017
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Taking it easy. Believe it or not, I’d accomplished two (visiting Walnut Canyon and Lowell Observatory) of the three main items on today’s to do list and it was barely 13:00. I took an easy drive down Mars Hill Road …
July 10, 2017
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At the end of the previous post, before my brief explanation of the Doppler effect, we left Vespo Slipher pondering the implications of his observations that the Sombrero nebula was moving away from the Milky Way while Andromeda was moving …
July 10, 2017
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Before I recount the rest of my Sunday, there’s a little material remaining in your lesson in astronomy and cosmology and the important role of the Lowell Observatory so let’s get started on that ending. Red shift, blue shift (more …