To determine the shape of the universe, we need to study how galaxies are distributed across the celestial dome; in other words, we need density measurements of numbers of galaxies in the universe. These measurements have been made, for which astronomy uses the redshift of spectral lines in the light spectrum of...

The laws of physics in proper frames (at high speed for example) are limited in their applicability. In the Large Hadron Collider (LHC) at CERN high speed particles are being researched. A key question is, to what extend can a (hypothetical) proper observer, travelling along with a proton in the LHC, apply the laws of...