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" ... But the Sun also increases in size, and if it creates too much drag on an orbiting planet, that planet will spiral into the Sun itself. The big question that should be on your mind is, with these two competing processes going head-to-head, which one will win for each planet? The most straightforward calculation would be to compute mass loss rates, orbital outspiral rates, and solar radius as a function of time, and see what happens. ... "
" ... Of course, plenty of other reactions are known to be irreversible as well: two orbiting black holes emit gravitational radiation and inspiral, but no orbiting black holes absorb gravitational radiation and outspiral, for example. But for the first time, scientists have demonstrated — assuming the laws of physics are what we think they are — that a purely classical system with only three masses isn't always time-reversible. The Universe really is unpredictable and chaotic at a fundamental level. ... "