Shadow life is a theory proposed by Paul Davies, which suggests that life may exist on Earth which has no evolutionary connection with any form of life currently known to science. If shadow life actually exists, this would greatly increase the prior probability of extraterrestrial life developing on other Earth-like planets.
Famous quotes containing the words shadow and/or life:
“When a shadow flits across the landscape of the soul where is the substance?”
—Henry David Thoreau (1817–1862)
“I feel the desire to be with you all the time. Oh, an occasional absence of a week or two is a good thing to give one the happiness of meeting again, but this living apart is in all ways bad. We have had our share of separate life during the four years of war. There is nothing in the small ambition of Congressional life, or in the gratified vanity which it sometimes affords, to compensate for separation from you. We must manage to live together hereafter. I can’t stand this, and will not.”
—Rutherford Birchard Hayes (1822–1893)