SP-419 SETI: The Search for Extraterrestrial Intelligence
A photograph of the Orion nebula taken
with the Thaw telescope of Allegheny Observatory. The Orion nebula is
a region of active star formation at present and contains not only
visible stars, but a number of intense radio and infrared sources.
The straight line emanating from the star below the nebulosity
indicates how that star might move across the field of view if it has
no planets, while the sinusoidal line indicates how the star would
appear to move if it had a planetary companion which could be
detected by precise astrometric observations.
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