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High-performance space module: Micro-integrated Extended Cavity Diode Laser (ECDL) for spectroscopy of rubidium atoms in space. Tests were conducted onboard the high-altitude research rocket FOKUS on April 23, 2015. The goal is to demonstrate whether different types of clocks actually keep time equally in space, as Einstein claimed. (© FBH/P. Immerz)

Tests in weightlessness aboard the research rocket FOKUS conducted. Successful technology demonstration for the QUANTUS mission.

Einstein verified – Precision experiments with lasers in space

According to Albert Einstein, clocks run slower the deeper they are in the gravitational potential of a mass – that is, the closer they are, for example, to a celestial body. This effect is called gravitational redshift within the framework of General Relativity – it manifests as spectral lines shif…

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