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Additional resources for Britannica Learning Library Volume 01 - Exploring Space
S. citizen in 1953. Chandrasekhar’s work on stars helped explain how the strange space phenomena called “black holes” are born. By the early 1930s scientists had True or decided that over billions of years a star false? Chandrasekhar changes its chemical makeup and its is known for energy drains away. The star then starts his work on to shrink, pulled into a tight ball by its the Sun. own gravity. It ends up about the size of the Earth and becomes a “white dwarf” star. Chandrasekhar, however, showed that this process happens only to stars about one and a half times the size of our Sun or smaller.
And his studies eventually showed that he was right. LEARN MORE! READ THESE ARTICLES… ASTRONOMY • JOHANNES KEPLER • SOLAR SYSTEM Answer: Copernicus studied the skies and finally decided that the Earth circles the Sun. © 2008 Encyclopædia Britannica, Inc. ★ © Bettmann/Corbis 45 DID YOU Kepler’s gra KNOW? ve was lost during a wa words he c r, but the omposed fo r his gravest I used to m one survive easure the : heavens, now I shall measure th e shadows Although m of the earth y soul was . from heave the shadow n, of my body lies here.
Others called it Herschel. In about 1850 error in the scientists began to use the name Uranus. following The spacecraft Voyager 2 visited Uranus some 200 years after sentence: When William Herschel discovered it. Findings confirmed that Uranus is Herschel discovered a large gas planet. Small amounts of methane gas in its upper Uranus in 1781, he atmosphere give the planet a blue-green color. named it Georgium It takes Uranus 84 of Earth’s years to go around the Sun Sidus for his dog. once, so its year is 84 times as long as ours.
Britannica Learning Library Volume 01 - Exploring Space by Encyclopædia Britannica, Inc.