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A proposed Bell-type test would show this order is not fixed in advance by hidden variables.","posed_since":"2019","precise":"Zych, Costa, Pikovski and Brukner (Nature Communications 2019) proposed a Bell-type inequality for the temporal order of events controlled by a massive body in spatial superposition. Using the weak-field proper-time difference $\\Delta \\tau \\sim G M \\Delta x t / (c^{2} d^{2})$, determine the minimal mass, separation and coherence time for a violation, and demonstrate it.","problem_ref":null,"references":"","settled_by":"Observation of the predicted violation with a source mass in spatial superposition.","status_note":"","title":"Bell test for temporal order using a mass in 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