How Does Simultaneity Affect Our Understanding of the Universe's Age?

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SUMMARY

The discussion centers on the implications of simultaneity in understanding the universe's age and expansion. It is established that from Earth's perspective, the universe is approximately 13.7 billion years old, while a particle traveling near the speed of light perceives the universe as much younger. The concept of proper time is crucial, as it highlights that while the laws of physics remain unchanged, different frames of reference yield varying measurements of time. This distinction is essential for grasping the relativistic effects on time perception.

PREREQUISITES
  • Understanding of Einstein's Theory of Relativity
  • Familiarity with the concept of proper time
  • Basic knowledge of cosmology and the Big Bang theory
  • Awareness of the implications of simultaneity in physics
NEXT STEPS
  • Research Einstein's Theory of Relativity and its implications on time perception
  • Study the concept of proper time in detail
  • Explore the Big Bang theory and its timeline
  • Investigate how simultaneity affects measurements in different frames of reference
USEFUL FOR

Students of physics, cosmologists, and anyone interested in the implications of relativity on our understanding of the universe's age and expansion.

cephied
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i am very new to this forum so i don't know if this posting is inappropriate in anyway. I had my only other posting removed so... with that being said, i am looking to better understand the implications of simultinaity as it pertains to the age and expansion of the universe. From the perspective of the earth, the universe seems to be somewhere in the neighborhood of 12 to 15 billion years old, but to a particle that has been traveling at near the speed of light since the big bang, the universe is nascent. Is this corrrect?
 
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Correct. Proper time is an important concept though. From the universe's frame of reference, it is 13.7 billion years old. Relativity didn't change the laws of physics. It still takes X years for event Y to happen. It's just that clocks outside Y's frame will measure different values.
 
Since this is a question rather than a tutorial, I am moving it to a physics thread.
 

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