The Beyond Einstein program is a NASA project designed to explore the limits of Einstein's theory of General Relativity. The project includes two space observatories, and several observational cosmology probes. The program culminates with the Einstein Vision probes, after completion of the Great Observatories program.
Constellation-X and the Laser Interferometer Space Antenna (LISA) been promoted by NASA as the Einstein Great Observatories, to differentiate them from the current generation. However, they are not a part of the Great Observatories program.
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“When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That’s relativity.”
—Albert Einstein (1879–1955)
“The westerner, normally, walks to get somewhere that he cannot get in an automobile or on horseback. Hiking for its own sake, for the sheer animal pleasure of good condition and brisk exercise, is not an easy thing for him to comprehend.”
—State of Utah, U.S. public relief program (1935-1943)