NASA, ESA, and Johan Richard (Caltech, USA); Acknowledgements: Davide de Martin & James Long (ESA/Hubble)You've heard of our greatest scientific theories: the theory of evolution, the Big Bang theory, the theory of gravity. You've also heard of the concept of a proof, and the claims that certain pieces of evidence prove the validities of these theories. If someone tells you a scientific theory has been proven, you should ask what they mean by that. Every scientific theory will someday fail, and when it does, that will herald a new era of scientific inquiry and discovery. And of all the scientific theories we've ever come up with, the best ones succeed for the longest amounts of time and over the greatest ranges possible.

Source: Forbes November 22, 2017 15:00 UTC