Space distance is expressed in light years. The universe has been said to be 13.8 billion. A static unexpanding universe where we have just detected a galaxy 30 billion light years away implies the light from that point took 30 billion years. Hubbles law explains regional restriction to the speed of light velocity boundry, and how this does not apply to objects of relation with such vast distance. I remember my 7th grade science teacher saying there is nothing faster than light. In a universe where we pick arbitrary start lines to measure speed, and all those points are in motion relative each other, how can we quantify the galactic speed limit? Let us place our start line on the front edge of a light wave in space. Lets measure the speed of the edge of the light wave moving in the opposite direction from the same light source. From the start line we just defined, the edge of the wave we are measuring is 2 times the speed of light. Apparently the object 30 billion light years away can exist in a universe that is only 13.8 billion years old. That same galaxy is moving away from us much faster than the galactic speed limit due to universal expansion. Relative to earth, that galaxy is moving faster than the speed of light.
Posted on: Thu, 24 Oct 2013 15:18:47 +0000
Trending Topics
Recently Viewed Topics
© 2015