Radio astronomy: Grote Reber builds the first radio telescope in Illinois and records a strong radio signature from the constellations Cygnus and Cassiopeia. This is the dawn of radio astronomy. In 1933, Karl Jansky of Bell Labs recorded a mysterious background noise from deep space, which he calls “star noise.” And astronomy also turns to the study of violent and frightening events, such as quasars and black holes, including the one at the center of our galaxy, in the constellation Cygnus. Then, in 1945, Frances Elisabeth Alexander discovers radio signals from the Sun, and in 1967, Jocelyne Bell-Burnell records periodic radio pulses (nicknamed LGM Little Green Men) emanating from stars later called pulsars.
