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Stars
Beginning of essay
Magnitudes
The magnitude scale was invented by an ancient Greek astronomer named Hipparchus
in about 150 BC He ranked the he could see in terms of their brightness,
with 1 representing the brightest down to 6 representing the faintest. Modern
astronomy has extended this system to stars brighter th ....
Middle of essay
....tionally contained hot gases
emitting electromagnetic radiation, especially light, as a result of nuclear
reactions inside the star. The sun is a star. With the sole exception of the sun,
the stars appear to be fixed, maintaining the same pattern in the skies year
after year. In fact the stars are in rapid motion, but their distances are so
great that their relative changes in position become apparent only over the
centuries. The number of stars visible to the naked eye from earth has been
estim.... |
| Number of words: 817 |
Approximate pages: 3 |
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