A Kruskal-like extension of the Taub-NUT (Newman, Unti, Tamburino) metric is given, clearly exhibiting the unusual properties of this metric. The new extension is incompatible with the extension of Misner and Taub, referred to as Taub-NUT space, and also with the further non-Hausdorff extension of the latter that has been proposed by various authors. The geodesic incompleteness of these various extensions is discussed.
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Miller et al. (1971) studied this question.
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