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spacetime
on 13 Oct 2022
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x = -25:1:25;
[X, Y ]=meshgrid(x,x);
Z=-20*exp(-0.2*sqrt((X).^2+(Y).^2));
mesh(X,Y,Z,LineWidth=0.5)
hold on
[X,Y,Z] = sphere;
r = 5.5;
surf(X*r,Y*r,Z*r,EdgeColor=[0 0 0])
view(-33,60)
colormap gray
axis off