The sun is expanding, not shrinking. In ~5 billion years it will expand, swallowing Mercury and Venus, and probably the Earth. If it does not, it will boil off the oceans and live the planet uninhabitable. Your statement about the moon, should it be correct, assumes the moon as always been in orbit around our planet. There is always a point at which mathematical models' predictions are no longer relevant--such as when you get negative numbers from something that models positive numbers. If you're creating a graph that correlates ice cream sales and number of ninjas, the line will eventually be negative somewhere on that graph assuming its slope is not zero. There obviously cannot be negative sales of ice cream or negative numbers of ninjas on the planet.
Also, saying "if it can't be observed, it isn't science" is a dangerous statement. Something more correct would be "if it can't be tested, it isn't science." The existence of the oort cloud can be tested via observation of itself directly, of things that may come from it, or perhaps even mathematical calculations or modeling. As far as I am aware, it is a hypothesis right now.
Also, saying "if it can't be observed, it isn't science" is a dangerous statement. Something more correct would be "if it can't be tested, it isn't science." The existence of the oort cloud can be tested via observation of itself directly, of things that may come from it, or perhaps even mathematical calculations or modeling. As far as I am aware, it is a hypothesis right now.
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