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by Monica Schroeder
$6.95
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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The center of the Milky Way is a crowded neighborhood and not always a calm one, as seen in this image from NASA's Chandra X-ray Observatory. In The... more
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The center of the Milky Way is a crowded neighborhood and not always a calm one, as seen in this image from NASA's Chandra X-ray Observatory. In The Drake Equation is used to calculate the possible number of extraterrestrial civilizations in the Milky Way Galaxy.
N = R* fp ne fl fi fc L
N = number of civilizations with which humans could communicate.
R* = mean rate of star formation.
fP = fraction of stars that have planets.
ne = mean number of planets that could support life per star with planets.
fl = fraction of life-supporting planets that develop life.
fi = fraction of planets with life where life develops intelligence.
fc = fraction of intelligent civilizations that develop communication.
L = mean length of time that civilizations can communicate. to the supermassive black hole at the center, the area is filled with all sorts of different inhabitants that affect and influence one another. The image shows three massive star clusters: the Arches...
$6.95
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