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Stars I
Stars I

... Stars range in size from about the size of the Earth to hundreds of times the Sun’s diameter ...
An Ancient Universe
An Ancient Universe

... Astronomers can also determine the speed a receding galaxies is seen in every direction in the sky. galaxy is moving by breaking up its light into its We are confined to view the stretching of space from component colors, rainbow-fashion. We call the light the Milky Way galaxy, but the same pattern ...
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... to pass through clouds of sulfuric acid, hurricane-force winds and lightning. On the ground, it would look like a very hazy, overcast day on Earth. Instead of cooling things down, the clouds on Venus reflect sunlight and trap heat, a lot like a greenhouse keeps plants warm. On Venus the 'greenhouse ...
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Neil F. Comins - Kuwait Life Sciences Company

... eaching and learning introductory astronomy have evolved dramatically in recent years. Students enter the classroom with varying degrees of preparation, interest, and misconceptions. Instructors, considering the diverse audience before them, often adjust their methods to address the variety of stude ...
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The Accuracy of the Astronomical Observations of Lewis and Clark*
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... A) It contains between 100 billion and 1 trillion stars. B) Our solar system is located very close to the center of the Milky Way Galaxy. C) The galaxy is about 100,000 light-years in diameter. D) One rotation of the galaxy takes about 200 million years. Answer: B 25) Which of the following correctl ...
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... than the sun and larger stars are more luminous that the sun. Space: Time and Distance There is so much space even within galaxies that normal distance measurements are meaningless or ineloquent. Scientists use a distance measurement in space that is expressed at the distance light will travel in th ...
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... composition, and brightness. Stars vary in their chemical composition. Astronomers use spectrographs to determine the elements found in stars. A spectrograph is a device that breaks light into colors and produces an image of the resulting spectrum. The brightness of a star depends upon both its size ...
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Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
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