3 ms·

Einstein didn’t know about the Michelson–Morley experiment.

• bsder 6y ago
  That is, at best, an open question: http://adsabs.harvard.edu/full/1974Obs....94...81J http://adsabs.harvard.edu/full/1974Obs....94...81J And, even if Einstein didn't know about it, people who read Einstein's paper did. That meant that Einstein's paper fell onto fertile soil rather than simply being a mathematical curiosity waiting to be discovered at a later time.