SP-419 SETI: The Search for Extraterrestrial Intelligence

Contours of equal ratio brightness at 21 cm, as measured with the Westerbork Synthesis Radio Telescope (operated by the Netherlands Foundation for Radio Astronomy) of Galaxy M51 compared with the optical image made by the Hale 200-inch telescope. The radio-image provides evidence of the continuity of M51.

Contours of equal ratio brightness at 21 cm, as measured with the Westerbork Synthesis Radio Telescope (operated by the Netherlands Foundation for Radio Astronomy) of Galaxy M51 compared with the optical image made by the Hale 200-inch telescope. The radio-image provides evidence of the continuity of M51.

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