Once Einstein began to work on gravity in 1907, science had come a long way from the days of Newton. Not only had electrical energy and magnetism been identified, but the idea of an electromagnetic field had substituted action-at-a-distance and was on the edge of replacing the ether. This led naturally to gravity likewise being seen as a field. After all, why would nature use a field for one force and action at a distance for another? There had likewise been fantastic developments in astronomy, partially because of Newton's new telescope. Two more planets had been discovered, with only Pluto remaining to be discovered (and later "benched"). However there still were no gravitational field equations-- the sine qua non of a true field. There additionally was a small issue pertaining to the orbit of the planet Mercury.
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