The signal was detected using the Suzaku and XMM-Newton orbiting X-ray telescopes.

FORBES: Scientists Detect Star Being Devoured By Supermassive Black Hole

The loop was seen using the European space telescope XMM-Newton to study it in X-ray wavelengths.

BBC: Arches Cluster, Leicester

Now Guido Risaliti of the Harvard-Smithsonian Center for Astrophysics and colleagues have looked at markedly higher energies - less subject to absorption in those gas layers - using Europe's XMM-Newton telescope and the recently launched Nustar telescope.

BBC: First glimpse of a black hole's spin

If they are using nothing but empirically established facts that have been vetted through rigorous due diligence, then Cam Newton is at the podium.

FORBES: The Heisman Voters' Dilemma: Facts Vs. Faith

Instead of using Newton's theory of gravity to examine why fast-moving stars remain within their galaxies, the pair applied general relativity, Einstein's theory of gravity, to the problem.

ECONOMIST: Cosmology