The year 2015 marks the 100th anniversary of Einstein's field equations. To celebrate this event, the Max Planck Institute for Gravitational Physics (or Albert Einstein Institute) will host a conference during the week of November 30, 2015, exactly one hundred years after the publication of Einstein's paper. The conference will take place in the recently renovated Harnack House, Ihnestr. 16-20, D-14195 Berlin, where Albert Einstein regularly lectured between 1915 and 1931.
Einstein explained that when two objects are moving at a constant speed as the relative motion between the two objects, instead of appealing to the ether as an absolute frame of reference that defined what was going on. If you and some astronaut, Amber, are moving in different spaceships and want to compare your observations, all that matters is how fast you and Amber are moving with respect to each other.
Credits:
http://www.slate.com/blogs/browbeat/2015/11/28/_david_tennant_explains_einstein_s_theory_of_relativity_on_its_100th_anniversary.html
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