![]() ![]() ![]() Depending upon the speed of the marble, it may escape the depression and pass the ball, but the depression might alter the marble's path. If you roll a marble toward the ball, it will fall into the depression (be attracted to the ball) and may even circle the ball (orbit) before it hits. The ball makes a depression in the sheet (a gravity well or gravity field). Imagine that you place a bowling ball in the middle of a rubber sheet. In his general theory of relativity, Albert Einstein envisioned gravity as a distortion of space caused by mass. In 1915, Albert Einstein realized that Newton's laws of motion and gravity didn't apply to objects in high gravity or at high speeds, like the speed of light. This observation frustrated astronomers since the mid-1800s. The orbit itself appeared to rotate (also known as precession). But one phenomenon that Newton's theories couldn't explain was the peculiar orbit of Mercury. ![]()
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