Those Who Watch
Encyclopedia
Those Who Watch is a science fiction
Science fiction
Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

 novel by Robert Silverberg
Robert Silverberg
Robert Silverberg is an American author, best known for writing science fiction. He is a multiple nominee of the Hugo Award and a winner of the Nebula Award.-Early years:...

, first published by Signet in 1967. The novel concerns a trio of alien explorers, each one surgically altered so that they outwardly appear human, who find themselves separated, and permanently stranded on Earth, after their ship explodes while hovering in low orbit
Low Earth orbit
A low Earth orbit is generally defined as an orbit within the locus extending from the Earth’s surface up to an altitude of 2,000 km...

. Each of the aliens is injured during the accident, and all are taken in and nursed back to health by kindly human beings.

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