February 18
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1930 - While studying photographs taken in January, astronomer Clyde Tombaugh discovers the planet Pluto.
1977 - The Space Shuttle Enterprise test vehicle goes on its maiden "flight" while sitting on top of a Boeing 747.
2021 - "Perseverance," a Mars rover designed to explore 'Jezero crater' on Mars, as part of NASA's Mars 2020 mission, lands successfully.
