Ray Bradbury,
Thought and Space
(1939)
“ Thought leaves the ancient Earth behind to mold. And when the galaxies have heeded DEATH, And welcomed lastly SPACE'S poisoned breath, Still shall thought travel as an arrow flown. SPACE--thy boundaries are TIME---AND TIME ALONE! This work is in the public domain in the United States because it was legally published within the United States (or the United Nations Headquarters in New York subject to Section 7 of the United States Headquarters Agreement) between 1928 and 1977 (inclusive) without a copyright notice. ”
