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Results tagged with Search options user 89504

The union of special (SR) and general (GR) relativity. Use this tag if both SR and GR apply.

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From Einstein's principle of relativity space-time and mass are relative to the frame from which they are being observed. Now would that mean a ball moving at the speed of light wrt to earth would …
asked Feb 27 '16 by user1062760
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Have we ever observed a body or particle with non zero mass traveling at almost $c$? I'm asking this because according to relativity as an object approaches light speed it's mass approaches infinity, so the particle or object might turn into a black hole? …
asked Feb 13 '16 by user1062760