Kruskal spacetime
= Kruskal spacetime
{c}
The <Kruskal spacetime> is the maximal analytic extension of the positive-mass vacuum <Schwarzschild spacetime>. It contains two exterior regions, a <black hole>, and a <white hole>. <Kruskal–Szekeres coordinates> remove both horizon coordinate singularities, while $r=0$ remains a <curvature singularity>.