What was the first planet ever made?
Five planets have been known since ancient times — Mercury, Venus, Mars, Jupiter, and Saturn. The first new planet discovered was Uranus. It was discovered by the English astronomer Sir William Herschel in 1781. Herschel was one of the first modern astronomers.
An unnamed planet, 2.5 times the mass of Jupiter, discovered in 1988 is believed to be the oldest known planet at 13 billion years old.
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