An odd material

The observation shows that the magnetic field lines are completely displaced by the sphere. The sphere itself therefore has a magnetization $\vec M$ , which is opposed to the outer field $\vec H$ and perfectly compensates for this, so that $\vec B = \vec M + \mu_0 \vec H = 0$ inside the sphere. Therefore, the magnetization showns linear relationship $\vec M = \mu_0 \chi \vec H$ with a magnetic susceptibility $\chi = -1$ . Materials with $\chi < 0$ are called diamagnets, but the absolute values for the susceptibility even for highly diamagnetic materials are 10,000 times lower, so that $|\chi| = \mathcal{O}(10^{-5}) ... \mathcal{O}(10^{-4})$ . The only exception are superconductors , which are perfect diamagnetic materials with $\chi = -1$ in addition to the property that they can conduct electrical current without resistance. The expulsion of a magnetic field from a superconductor is also called Meissner–Ochsenfeld effect , that can be demonstrated by levitating a small magnet above the superconductor.

Therefore, the aliens found a material, that is a superconductor at room temperature. This is striking news for solid-state physics!