One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate.’
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...
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On this date: Galileo discovers three major moons of Jupiter
On this date, Jan. 7, 1610, astronomer Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated ...
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Galileo
Galileo has a special kind of versatility. You’ll feel equally comfortable dropping by for a drink on your own, with your boss or a date, or with the whole gang on a bachelorette weekend. Better ...
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Two Types of Telescopes
Galileo played with this formula until ... Ten years after that, 40 to 50 feet. By 1673, [Polish astronomer] Johannes Hevelius had constructed a telescope 150 feet long on the shores of the ...