Question

Briefly explain why the conclusion that dark matter exists rests on assuming that we correctly understand gravity. Explain whether it is possible that our understanding of gravity is incorrect.

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Answer 1

First of all , let us understand what dark matter really is. It is nothing but missing mass just because there is no visible light. For example - let's say a galaxy is moving extremely fast around another central galaxy, but we found that the mass of central galaxy is not enough that the moving galaxy can rotate that faster so there must be something else, which we cannot see , which is responsible for extreme gravitation force, this is what we call as dark matter because we just cannot see it but we know that is there.

Now, let's come to the question,

first of all, we must understand gravity is a universal force and our understanding of gravity is much accurate and well established. This gravity combined with Newton's law is used to find orbital speeds and from the speeds, we argue about the existence of dark matter. We also infer the that dark matter exist because of its gravitational influence of matter that we can see and it is properly accepted by all the scientists. Our understanding of gravity cannot be wrong because there have been so many positive observations which make it well established theory.