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1 - The History Of Our Universe Made Easy (Part 1)
. But when the French astronomer Pierre Janssen pointed a spectroscope at the Sun, in 1868, he found a set of spectral lines no one had ever seen before. It was a completely unknown element. He called it Helium, after the greek word Helios, the Sun. The new element also showed up in stars along with another abundant element, Hydrogen. Inside this tightly bound universe, which they called the galaxy, astronomers could see strange swirling clouds through their telescopes. Some astronomers ...