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In 2008, Laskar and Gastineau simulated 2500 futures for the Solar System, changing the initial position of Mercury by about 1 meter. In 20 cases, Mercury went into a dangerous orbit! Often it collided with Venus or the Sun - but in one case it made Mars hit the Earth. (8/n)
But here's the good news: the work of Laskar and Gastineau - and also another team - shows that nothing dramatic should happen to the planets' orbits for the next billion years. So we can worry about other things. (9/n)
In the *really* long term, most of the stars in the Milky Way will be ejected. Through random encounters, individual stars will pick up enough speed to reach escape velocity. The whole Galaxy will slowly "boil away". It will dissipate in about 10^19 years. (10/n, n = 10)
So what you're saying is, we have one billion years to invent propellers we can strap to an entire planet to correct its orbit, "The Wandering Earth" style.
Mmmmm is their simulation robust? That is does the stability time change by any kind of comet storm, or any other possible and probable event?
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