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Supernovas are massive exploding stars in the Milky Way, which are visible from Earth. Eventually, they become incorporated into new planets and stars. In this way, the heavy element content of the Milky Way and other spiral galaxies is slowly but steadily increased.
NOT so long ago there was a lively argument about the origins of galactic red shifts. This is the phenomenon first discovered by US astronomer Vesto Slipher at the Lowell Observatory in Arizona in the United States that the light from many galaxies is shifted towards the red end of the spectrum as compared with light from the Sun.