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When the 10-meter-high tsunami wave that followed the March 2011 magnitude 9.0 earthquake in Japan receded, it took with it some 23 million metric tons of material, including pieces of buildings, wood, plastics and more. Whereas most of the wreckage sank to the ocean floor, some of it is still floating toward other Pacific nations . The "debris field"--the visible wave of material--has dissipated, leaving the junk invisible to satellites.

UPDATE: See our latest skywatching tips to see Mars at opposition here: Mars Visible in Night Sky, But Its 2 Moons Are Hard to Spot [More]

"Seeing something invisible with your own eyes is an exciting experience," say Joachim Fischer and Tolga Ergin. For about one year, both physicists and members of the team of Professor Martin Wegener at KIT's Center for Functional Nanostructures (CFN) have worked on refining the structure of the Karlsruhe invisibility cloak to such an extent that it is also effective in the visible spectral range.

(PhysOrg.com) -- Like gravity, the strong interaction is a fundamental force of nature. It is the essential "glue" that holds atomic nuclei—composed of protons and neutrons— together to form atoms, the building blocks of nearly all the visible matter in the universe. Despite its prevalence in nature, researchers are still searching for the precise laws that govern the strong force