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light energy
light energy

... • Distances can be deceiving: Bright stars look close, but may be very far away Star Approx. Distance (LY) P. Centari ...
Scientific Methods
Scientific Methods

... The term "error" signifies a deviation of the result from some "true" value. Often we cannot know what the true value is, and we can determine only estimates of the errors inherent in the experiment. If we repeat the experiment, the results may differ from those of the first attempt. We can express ...
Powers Of Ten
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... From this distance, all the galaxies look small with inmense empty spaces in between. The same laws are ruling in all bodies of the Universe. We could continue traveling upwards with our imagination, but now we will return home quickly ...
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... label it "Sun." Discuss how we see the band of faint starlight in our sky that we call the Milky Way given our Sun's position in the galaxy. Explain how all the stars we can see in the night sky are members of this galaxy and that there are countless other galaxies. The central nucleus may be labele ...
SSG Coordinators will be at the Cronan Ranch observing site at 5
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Lecture 29 - Empyrean Quest Publishers
Lecture 29 - Empyrean Quest Publishers

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... = 9.0 x 1010 solar masses. That the mass enclosed within Ro is about 1011 solar masses is at once both comforting and disturbing. Comforting, in that it is the correct order of magnitude, as the mass of visible matter in the Milky Way is about 1011 solar masses, as previously mentioned. However, not ...
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Cosmic distance ladder



The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.
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