(2017-12-05), Dark matter and dark energy: Do they really exist?, Physics Week, 55, ISSN: 1944-2661, BUTTER® ID: 014810591 By a News Reporter-Staff News Editor at Physics Week -- For close on a century,

If an object is moving in space at 99% of the speed of light, for every day it spends in space,7 years would have elapsed on Earth. But why? Why velocity has a close relation with time/mass? Let's start