There is a fundamental difference between religion, which is based on authority, [and] science, which is based on observation and reason. Science will win because it works.
Science is beautiful when it makes simple explanations of phenomena or connections between different observations.
A model is a good model if first it interprets a wide range of observations in terms of a simple and elegant model, and second if the model makes definite predictions that can be tested, and possibly falsified, by observation.
Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.
Observations indicate that the universe is expanding at an ever-increasing rate. It will expand forever, getting emptier and darker. Although the universe doesn’t have an end, it had a beginning in the Big Bang. One might ask what is before that but the answer is that there is nowhere before the Big Bang just as there is nowhere south of the South Pole.
A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations.
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