All the planets and smaller bodies gravitationally influence each other, meaning that any imprecision on today’s trajectory is multiplied by ten every 10 million years.
We can never overcome this limitation, even if the inaccuracy started out less than a trillionth of a trillionth of an inch
If I jump in the air, Earth moves more than that.
exoplanet.eu website shows 353 exoplanets. The table indicates 146 have semi-major axis 1-8 AU, the average mass is a little more than 4 Jupiters, average semi-major axis 2.26 AU and average eccentricity is 0.3087. 102 of the 353 listed are apparently hot Jupiters.
Fermi Paradox 'If there are aliens, where are they?' needs some updates scaling our solar system's proportions when we have a larger exoplanetary database
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