Uncovering the Mystery: 2D Creatures on Expanding Sphere

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    Expanding Sphere
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SUMMARY

The discussion centers on the existence of 2D creatures living on an expanding sphere, which they perceive as a flat plane. The key factors include the radius of the sphere increasing over time and the maximum speed of information being the speed of light. The creatures' lifespan is significantly shorter than the time it takes for light to traverse the radius of the sphere. The user attempted to apply the Doppler effect to help the creatures realize their true environment but found the effect too minimal to be noticeable.

PREREQUISITES
  • Understanding of 2D geometry and spatial perception
  • Familiarity with the concept of the speed of light as a universal constant
  • Knowledge of the Doppler effect and its mathematical equations
  • Basic principles of differential calculus, specifically related to rates of change (dR/dt)
NEXT STEPS
  • Research the implications of spatial perception in non-Euclidean geometries
  • Explore advanced applications of the Doppler effect in varying dimensional contexts
  • Study the relationship between lifespan and perception of speed in relativistic physics
  • Investigate mathematical models for expanding geometries and their effects on inhabitants
USEFUL FOR

This discussion is beneficial for physicists, mathematicians, and anyone interested in the intersection of geometry, perception, and relativistic effects in theoretical environments.

Behrad
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Some 2D creatures are living on a sphere that it radius in increasing over time. They think that they are living on a expanding plane. The max speed of information is speed of light. The life time of the creatures are very smaller that the radius divided by speed of light. How can they find out they are living on a sphere. I tried to use doppler effect but it couldn't

P.n. Sorry for my bad english!
 
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I also wrote the doppler effect equations but the effect was very small that they couldn't notice.

And my problem depends on the amount of dR/dt
 

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