Einstein's Theory of Gravity

Einstein's theory of gravity was based on an observation that had been made by galileo three or 400 years before. He imagined being in air craft far away from the gravity of any planet, so zero gravity, and the spacecraft is accelerating at one g. But if you were looking from outside, if the spacecraft were transparent, you'd seethat there's a really simple explanation for it. They don't move all at once. How can it not? Because there's only one tton we think of newton thought that was tethered to the sun,. So einstein realized this force, which he called 'the invisible force',  was actually gravitational. The reason we