13th March 1930 – The discovery of Pluto was announced
Published On: March 12, 2018 | Last Updated On: November 26, 2020/On This Day
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The discovery of a ninth planet (Pluto) was announced by Clyde W. Tombaugh. Pluto is a dwarf planet in the Kuiper belt with a radius of 1,188 km and an orbital period of 248 years.