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8-3-Star_Classification STUDENT
8-3-Star_Classification STUDENT

... is how much light is actually given off by a star. ...
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Feb 2017 - What`s Out Tonight?

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Mar 2017 - What`s Out Tonight?
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... MKK classification  Luminosity (M) directly from spectrum.  Hence find D. Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m  log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as  Uma (ie Mv = -0.3), then it would be 50 % farther away. In ...
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... periodic shift of its spectral lines. This shift is caused by the Doppler effect as the orbits of the stars carry them alternately toward and away from Earth. An eclipsing binary is a system whose orbits are viewed nearly edge-on from Earth, so that one star periodically eclipses the other. Detailed ...
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... One of the nebulae visible in the fall is the Eagle Nebula, M16, in the constellation Serpens. M16 is 7,000 light years away and has 3 huge “pillars” of dark dust that are silhouetted against the nebula in the background. One of the most famous Hubble images depicts these “Pillars of Creation” and s ...
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The Milky Way - Department of Physics

... New distance scale: 1 light year (ly) = Distance traveled by light in 1 year = 63,000 AU = 1013 km ...
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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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