The sun is only 93M miles away and earth is burning up because of βclimate changeβ and you are talking about an entire Galaxy that emits enough energy to light up the sky 650M light years away. Think about it rationally, how is that even possible? π
Discussion
Actually, light can carries enough energy to burn objects in its path, regardless of the distance it travels. However, the amount of energy it carries is determined by its wavelength/frequency, not distance.
For instance, we can even see the Andromeda Galaxy with our naked eyes, that is also 2.5 million light-years away, which proves that light can travel vast distances without causing damage.
If E=mc2 is true, then the amount of energy needed for something to travel at the speed of light is infinite! Now imagine the energy needed to sustain that speed for 650M lightyears. For you to say, the amount energy needed to create that light is large but not large enough to burn every other galaxy in it vicinity is just not plausible. Either the galaxy is not 650M lightyears away or E=mc2 is wrong or both could be wrong π€·π»ββοΈπ
Firstly, it is impossible for an object with mass to travel at the speed of light, Light does not carry any mass in the traditional sense, as it is composed of massless particles called photons.
The energy needed to create light is not related to the energy needed to sustain a certain speed.
The energy from a galaxy's light is spread out over a vast distance and is not concentrated enough to cause any significant heating or burning of nearby galaxies.
And also we not observing these faraway stars & galaxies using normal light.
But I respect your opinion, I may not agree with it but that's a beauty freedom.
You are regurgitating what they told you without questioning how rational or logical they are but if that makes you happy, carry on π
Sorry to butt in, but I think what iefan means is that the formula is EΒ²=(mcΒ²)Β²+(pc)Β².
E=mcΒ² is only a special case of that: when an object is not moving relative to you and it has mass.
Light has no mass. And thatβs why the special case for that is E=pc.
So no, E=mcΒ² doesnβt always hold true. Unfortunately physicists have failed to explain that clearly to us laypeople. Alas, much lamenting among them about this confusionβ¦