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1. Until 1923 scientists thought that the entire universe was just our milky way- until astronomer Edwin Hubble discovered that the astron... -
Black Hole The Milky Way is a barred spiral galaxy made up of hundreds of billions of stars and planets. It measures a mind-boggling 1... -
Saturn 10. On Saturn it may rain millions of pounds of diamonds every year when the atmosphere has such high heat and pressure the sci...