The Milky Way galaxy is a galaxy in the universe that includes planets, stars, etc. of its own. It was mapped through radio waves by Grote Reber.
Who was Grote Reber?
Grote Reber was an American amateur astronomer who worked in the field of radio astronomy. He was majorly known for the discovery of supernovas and galaxies.
He built the radio telescope that was used to map the Milky Way Galaxy by the band of bright radio emissions. Also, he used cosmic radio sources to discover celestial bodies.
Therefore, option B. Grote Reber mapped the galaxy.
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