Sphere

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Sphere[{x, y, z}]

is a sphere of radius 1 centered at the point {x, y, z}.

Sphere[{x, y, z}, r]

is a sphere of radius r centered at the point {x, y, z}.

Sphere[{{$x_1$, $y_1$, $z_1$}, {$x_2$, $y_2$, $z_2$}, ... }, r]

is a collection spheres of radius r centered at the points {$x_1$, $y_2$, $z_2$}, {$x_2$, $y_2$, $z_2$}, ...

Graphics3D
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