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Find number abc

If 30843 - a0a4c = 20c9b find number abc. Multiple solutions may exist.

Correct answers: 18

The first user who solved this task is Nasrin 24 T.

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Vesto Melvin Slipher

Born 11 Nov 1875; died 8 Nov 1969 at age 93.American astronomer whose systematic observations (1912-25) of the extraordinary radial velocities of spiral galaxies provided the first evidence supporting the expanding-universe theory. Slipher spectroscopically measured the displacement of their spectral lines by the Doppler effect by which the wavelength of light from an object moving away from an observer will shifted toward the red end of the spectrum. Earlier, Slipher had determined the rotation periods of some of the planets by spectroscopic means. With Lowell (1912), he found Uranus had a rotation period of 10.8 hours. He also produced comparable data for Venus, Mars, Jupiter, and Saturn and showed that Venus's period was much longer than expected.

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