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Karl Jansky with his Milky Way Map
Karl Guthe Jansky joined the staff of the Bell Telephone Laboratories in Holmdel, New Jersey in 1928. While hunting for radio static for Bell Labs, Jansky made the surprise discovery of radio waves coming from the center of our Milky Way Galaxy. In this photo, he is standing under a rough map of the night sky and pointing to the constellation of Cassiopeia. The wavy lines track the radio emissions he discovered on the chart paper, which also line up with the disk of our Galaxy, the Milky Way.
To balance their speeds out to those distances from their massive central cores, the galaxies must be made of more stuff than just that which we can detect.
