Proxima Centauri: 4.2 Light Yrs from Sun

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Proxima Centauri is the closest star to the Sun, located 4.2 light years away. Light from Proxima Centauri takes 4.2 years to reach Earth, prompting questions about its motion. The discussion revolves around whether light moves at a constant speed or experiences acceleration. Participants are encouraged to research the nature of light's motion and apply relevant formulas to understand its distance in its own frame. Understanding light's behavior is essential for answering the initial question.
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The nearest star to the Sun is Proxima Centauri, a very faint component of the Alpha Centauri system. It takes light 4.2 years to reach us from Proxima. In the light's own frame, how far away is it?
 
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Do you know what kind of motion light has?
You could look that up and the kind of motion would tell you what formula to use for that motion.
 
No, that was the exact question.
 
So, does light move with constant speed or does it have accelerated motion?
If you don't know, look it up! When you know, write the formula(s) that apply to that kind of motion and see if one of them will find the answer you seek.
 
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