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Frame-dragging is an important general relativistic effect that has been observed in the weak-field limit by the Gravity Probe B experiment for the gravitational field of the Earth.

Although the effect is relatively small for the Earth, it is prominent for compact objects like black holes and neutron stars. So the observational verification of this effect around such compact objects is important in studies of accretion flows around such compact objects.

I am interested to know whether any attempt has been made for observational verification of frame-dragging in the strong-gravity limit, i.e., around black holes and neutron stars, or any planned NASA mission in future?

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I think the observations of Sag A* are getting to the point where the spin of the blackhole can be measured, whether that's is through frame-dragging or "just" the de Sitter effect, idk.

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  • $\begingroup$ Are you talking about EHT data? In that case, polarization data can give insights to frame-dragging. $\endgroup$
    – Richard
    Commented Aug 8, 2023 at 19:19
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    $\begingroup$ No, Andrea Ghez's observations. See: 2020 Nobel Prize. $\endgroup$
    – JEB
    Commented Aug 8, 2023 at 23:17

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