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The Hertzsprung-Russell Diagram Classifying Stars & Tracing Stellar Evolution Arguably, the most important diagram in astronomy, the Hertzsprung-Russell Diagram (HRD), shows how plotting the brightness of stars against their surface […] |
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In 2006, the International Astronomical Union adopted a definition of a planet that demoted Pluto to just one of what is likely hundreds of dwarf planets in our Solar System. […] |
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Why does a telescope need an equatorial mount, and what makes it different from simpler fixed or altitude–azimuth designs? This beginner-friendly talk starts with the basic problem of following objects […] |
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We continue our revisiting of The Cosmos Series. Episode 3: Subject: History of astronomy from astrology to Kepler’s laws; Ptolemy, Copernicus, Brahe, Galileo; scientific method triumph. 45 Years Later: […] |
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