Ariel, Umbriel and the man who made them real

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The discovery of Ariel and Umbriel — two of Uranus’ many moons — took place 175 years ago on October 24, 1851. It was an amateur astronomer, William Lassell, who discovered these two satellites and two more as well. A.S.Ganesh tells you how Lassell played his part in astronomy…