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The heavenly bodies we know as fixed stars are suns which are so distant that we see them as points of light. They
are called that because, due to the great distance that separates them
from us, they take thousands of years to move in a clear fashion to a
terrestrial observer. This is why we group them into constellations like the one in the picture (Little dipper), which are seen as changeless over the millenia. |
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The stars are born in clouds of dense cold gases, which heat up as they condense. They normally are born in groups.
The luminosity and temperature of the stars increases rapidly with their mass.
The hottest stars appear more blueish to us and have a shorter life
than the reddish stars with a smaller mass and lower temperature.
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