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includes lesson plans on wavelengths and frequencies, sizes of stars, gamma-ray bursts, the binary number system, the probability of life elsewhere in the universe, constructing and analyzing images from digital satellite data, measuring periodic behavior, logarithmic plotting and classification of objects by their mathematical behavior, the origin of the elements and their identification in supernova remnants, and identifying elements using spectroscopy. (National Aeronautics and Space Administration)
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Nicolaus Copernicus (1473-1543) was a Polish astronomer who advanced the theory that the Earth and other planets revolve around the Sun (the "heliocentric" theory). This was highly controversial at the time, since the prevailing Ptolemaic model held that the Earth was the center of the universe, and all objects, including the sun, circle it. |
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How big is that star? |
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