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223 pages, Mass Market Paperback
First published January 1, 1955
“You might say,” the answer came, “that we’re your celestial cousins. Of the vast number of planets that support life, only six that we know of—seven if you include the two-headed people of Gryno—have a dominant human society.But at the end of the book, there are no other known inhabited planets:
“Aren’t there any other inhabited planets besides Earth and Planet Five?” “We can’t be certain,” Logar said, “but we know of no others.”