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astrophysics |
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astrophysics) The Hertzsprung-Russell diagram relates the brightness (or luminosity) of a star to its temperature. Most stars fall within a narrow diagonal band called the main sequence. A star moves off the main sequence when it grows old. Study of the physical nature of stars, galaxies, and the universe. It began with the development of spectroscopy in the 19th century, which allowed astronomers to analyse the composition of stars from their light. Astrophysicists view the universe as a vast natural laboratory in which they can study matter under conditions of temperature, pressure, and density that are unattainable on Earth. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The search for these two elements is the fundamental task facing astrophysicists today, writes Hooper, a theoretical astrophysicist. Neil Tyson is an astrophysicist and director of New York City's Hayden Planetarium. Readers will fall into the plot as main character Professor Percival Marlowe, an incredibly intellectual astrophysicist is nearing death without having the closure of finishing his greatest discovery. |
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astrophysicist
