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·Astronomy: Observatory - WHERE IN THE WORLD
 

 
 
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  Star Star: Astronomy: Star - STAR COLORS

STAR COLORS

A star's luminosity, color, and surface temperature are correlated. Most red stars are cool and dim, and most white are hot and bright. But there are some important exceptionsg

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:14:28 CST (8 reads)
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  Star Star: Astronomy: Star - STAR BRIGHT

STAR BRIGHT

Astronomers designate a star's brightness in visible light by its apparent magnitude. The faintest star you can see with the naked eye is about magnitude 6. Most stars brighter than this are numbered from 5 to 0, with each difference equivalent to a jump in brightness of 2.512 times.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:13:45 CST (8 reads)
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  Star Star: Astronomy: Star - OBSERVING STARS

OBSERVING STARS

To appreciate the aesthetics ot a starry sky, all you need are your eyes and perhaps a pair of binoculars. But a telescope helps you study each star up close.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:13:00 CST (7 reads)
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  Star Star: Astronomy: Star - STAR MOTIONS

STAR MOTIONS

Compared to their distances from Earth, the space stars traverse is so minuscule that they appear immobile. Stars do move, though—the Sun, for example, has a space velocity of about 12 miles per second (20 km/s) in the direction of the star Vega.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:12:17 CST (9 reads)
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  Star Star: Astronomy: Star - DISTANCES

DISTANCES

The stars lie at mind-boggling distances. The nearest stars are a little more than 4 light-years away; those making up the dusty Milky Way around Auriga lie at an average distance of 2,500 light-years.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:11:31 CST (8 reads)
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  Star Star: Astronomy: Star - ANNIE JUMP CANNON

ANNIE JUMP CANNON

The monumental task of classifying the spectra of stars was under-taken in the early 1900s by Annie jump Cannon: (1863-1941) at the Harvard College Observatory, Massachusetts. Cannon worked as a "computer," which meant someone who tirelessly examined hundreds of thousands of photographic plates, of stellar spectra.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:10:40 CST (8 reads)
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  Star Star: Astronomy: Star

STARS

People have always sought to understand the stars. The journey begins when you go outside on a dear night and look up.

 
 
  Posted by astronomy on Tuesday, December 07 @ 14:09:50 CST (9 reads)
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