Question: Light from distant source in observable universe reaches us in 13.75 billion light years; could redshift be caused by 'tired' light and not an expanding universe? Light cannot have infinite energy so it must slow or stop?
Is there a theoretical maximum possible light intensity? Why, or why not?
Can black holes be used to prevent the heat death of the universe?
Is it possible for two photons to overlap and join their energy to structure a one photon of higher frequency?
If it’s true according to theoretical physics (Dirac equation etc.) that there should be equal amounts of matter and