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Free research papers and essays on topics related to: stellar evolution
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- Astronomers - 1,780 words
Astronomers Part One Brief Descriptions of the Following Astronomers: Walter Baade : Baade was a German-born American, whose work gave new estimates for the age and size of the universe. During the wartime, blackouts aided his observatons and allowed him to indentify and classify stars in a new and useful way, and led him to increase and improve Hubble's values for the size and age of the universe (to the great relief of geologists.) He also worked on supernovae and radiostars. Milton Humason : Humason was a colleague of Edwin Hubble's at Mt. Wilson and Palomar Mtn. who was instrumental in measuring faint galaxy spectra providing evidence for the expansion of the universe. Jan Oort : In 1927 ...
Related: catholic church, isaac newton, solar system, holland, medieval
- Black Holes - 1,163 words
Black Holes Peters 1 Ron Peters Dr. James R. Pierce CP English 2 20 April 2000 Black Holes A Black hole is a theorized celestial body whose surface gravity is so strong that nothing, including light, can escape from within it's surface. Gravity is the key to a black hole's immense power. The black hole's strong gravity keeps captured material from escaping. For example, if Earth were the same mass it is now but had only one-fourth its present radius, the escape velocity of someone standing on its surface would be twice what it is now. Black holes have a power far greater than our minds can imagine. This report will go into further discussion on these massive holes in space. Now, though, astr ...
Related: black hole, black holes, albert einstein, hubble space, traveling
- Ptolemy Of Alexandria - 517 words
Ptolemy of Alexandria Ptolemy of Alexandria was the most influential astronomer of the ancient world. The books and theories Ptolemy developed served as a major basis for future astronomers. It was during the Renaissance period that his work became thoroughly studied and revised. Ptolemy collected all ancient knowledge of astronomy and geography including it in his book Almagest around 140 A.D. It follows, he then wrote a four volume astrological study known as the Tretrabiblos. Ptolemy claimed that the scribes of Babylon had been instructed since 750 B.C to keep detailed astronomical diaries. These diaries were written for seven hundred years on clay tablets. The tablets depicted night-sky ...
Related: alexandria, ptolemy, first person, stellar evolution, greek
- Stars - 1,896 words
... jects with a starlike composition but too small to initiate nuclear reactions may also exist in the universe, helping to account for the "missing mass" of COSMOLOGY theories (see BROWN DWARF). Mass More than half of all stars are BINARY STARS--two or more stars that orbit one another. About 100 orbits have been measured accurately. These measurements provide perhaps the most important characteristic of a star: its mass. From Newton's Laws of gravitation and motion, it is known that two highly massive stars must orbit (one around the other) faster than two stars of lesser mass at the same distance apart; thus the masses can be calculated from the orbit size and the period of the orbit. If ...
Related: north star, stars, total number, white dwarfs, hall
- Supernovas - 694 words
Supernovas A supernova is a STAR that explodes. It suddenly increases in brightness by a factor of many billions, and within a few weeks it slowly fades. In terms of the human lifespan, such explosions are rare occurrences. In our Milky Way galaxy, for example, a supernova may be observed every few hundred years. Three such explosions are recorded in history: in 1054, in 1572, and in 1604. The CRAB NEBULA consists of material ejected by the supernova of 1054. Such materials, known as supernova remnants, are common in the heavens. The supernovas observed in modern times have all occurred in other galaxies, the most distant yet having been detected in 1988 in a galaxy 5 billion light-years awa ...
Related: solar system, milky way galaxy, important role, shortly, lifespan
- The Stars And Galaxies - 412 words
The Stars And Galaxies MEGAN JACKSON MS. KEYS SCIENCE DECEMBER 5,2000 THE STARS AND GALAXIES Have you ever looked up at the sky and wondered what are those bright and shiny things up there. Stars: a natural luminious body visible in the sky especially at night. A self-luminious gaseous celestial body ofgreat mass which produces energy by means of nuclear fusion reactions, whose shape is usually spheroidal, and whose size may be as small as the earth or larger than the earths orbit. Galaxies: Any of the very large groups of stars and associated matter that are found throughout the universe. In 1802, William Wollaston noted that the spectrum of sunlight did not appear to be a continious band o ...
Related: stars, stellar evolution, nuclear fusion, large numbers, composition
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