Principles of Relativity

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
AST201H-­‐  Stars  and  Galaxies         Professor  Michael  Reid                                                                                                                            Lecture  Notes     March  12,  2013   Lecture  16:  Principles  of  Relativity   Relativity   • We  can  only  measure  motion  relative  to  a  given  frame  of  reference   • The  speed  of  light  is  not  only  a  constant  in  time,  but  it  is  also  invariant   o The  speed  of  light  never  change   • Invariance  of  Speed  of  Light  has  some  bizarre  consequences   o Time  Dilation:     § The  speed  measured  by  the  two  observers  disagree,  but  the   times  agree   § If  the  speed  of  light  is  absolute,  different  observers  must   disagree  about  with  the  time  intervals.   § The  consequence  goes  both  ways.  There  is  symmetry.  Both   think  the  other  moves  slower  than  themselves   § Happens  more  when  things
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