![]() ![]() That is, without physical contact, any change in the position of one mass is instantly communicated to all other masses. This speed limit on the Universe was also a challenge to the inherent assumption in Newton’s law of gravitation that gravity is an action-at-a-distance force. Almost all of the mechanics you learned in previous chapters, while remarkably accurate even for speeds of many thousands of miles per second, begin to fail when approaching the speed of light. Two people moving relative to one another do not agree on the length of objects or the passage of time. ![]() However, it has incredible consequences-space and time are no longer absolute. This simple fact has been verified in countless experiments. In this theory, no motion can exceed the speed of light-it is the speed limit of the Universe. This theory is discussed in great detail in Relativity, so we say only a few words here. In 1905, Albert Einstein published his theory of special relativity. In this section, we examine a different way of envisioning gravitation. Nevertheless, many phenomena have shown a discrepancy from what Newton’s laws predict, including the orbit of Mercury and the effect that gravity has on light. The paths of Earth-crossing asteroids, and most other celestial objects, can be accurately determined solely with Newton’s laws. Indeed, only Newton’s laws have been needed to accurately send every space vehicle on its journey. Newton’s law of universal gravitation accurately predicts much of what we see within our solar system. Calculate the Schwarzschild radius of an object.Describe how the theory of general relativity approaches gravitation. ![]() By the end of this section, you will be able to: ![]()
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