Re: Time travel - Speed of light
^^ Maybe But you have to admit that he was a gifted scientist. He called his Universal constant, (that he added into his equations, cause his equations were predicting expanding universe though he though that universe is static, thus added a constant to make his equations shows a static universe) the biggest blunder of his life.
Very recently, scientists realized that they want that constant back cause universe seems to be expanding far more rapidly then it should
How do scientists know universe is expanding? do they take snapshots are regular of intervals of different galaxies and compare the distance?