Science: Beyond Earth

Last week Dr. Charles Greeley Abbot, head of the Smithsonian Institution and world-famed authority on solar radiation, declared that if William Shakespeare had lived in the 20th Century he would have become an astronomer. One thing Astronomer Shakespeare would have had to get straight from the start is the different classes of nebulae. Astronomers apply nebula not only to whole galaxies of stars far beyond the Milky Way. but also to patches of dark or faintly luminous matter within the Milky Way, which is the home galaxy of earthlings. They may be distinguished...

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