Time Travel, Space and Time - The Speed of Light - Relativity - Albert Einstein #science #physics #astrophysics
<!--?xml encoding="utf-8" ?--><p>Time Travel, What is a Light Year? Space and Time - The Speed of Light - Relativity - Albert Einstein</p><p>By the late 1800's, it was becoming obvious that there were some serious problems for Newtonian physics concerning...See more