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Astronomy

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  • $\begingroup$ @ShakesBeerCH it looks like your edit was rejected, but there was indeed an error in the arithmetic. $GM_J/(R_E+R_J)^2=20.9$ m/s^2, etc. Can you check again, thanks! $\endgroup$
    – uhoh
    Commented May 27, 2019 at 17:33
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    $\begingroup$ TL:DR Jupiter isn't dense enough for its gravity gradient over Earth's radius to produce a 1g tidal acceleration, even right at Jupiter's surface. $\endgroup$
    – Peter Cordes
    Commented May 27, 2019 at 22:56
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    $\begingroup$ @PeterCordes that's so much better than I could have done I've just quoted you, thank you. Please feel free to edit the answer further! $\endgroup$
    – uhoh
    Commented May 28, 2019 at 0:06
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    $\begingroup$ Glad I could help, thanks for doing the math and writing it up, this is an interesting Q&A. :) I thought about adding in the phrasing "having the Earth pulled out from under them (even faster than the extra pull of Earth + Jupiter)" for the people on the far side, but I don't see a place to put it without being redundant or rewriting a whole chunk. $\endgroup$
    – Peter Cordes
    Commented May 28, 2019 at 4:07
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    $\begingroup$ "On the close side, being 6,378 kilometers closer, would feel an acceleration 1.2 m/s^2 less" <- 1.2 m/s^2 more? $\endgroup$
    – Logan Pickup
    Commented May 30, 2019 at 6:03