Eli5 if time is relative and gets effected by gravity how could we possibly determine the age of our universe?
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Actually, because mass creates gravity and mass is actually light at a very low energy state, and because we know the sun isn’t held by the gravity of the black hole in our solar system and the earth isn’t held by the sun’s gravity, and the moon etc. We invented dark matter to make it all work, then time is all screwed up. In fact, distance wise, those stars could be right next to us but the matter between us slows time so much that they look and feel very far away. Light and time are bent and slowed.
If you really want to go quantum, then according to relativity, if there is no such thing as dark matter then there is no matter between us and those distant galaxies which means there is no time between us. This means the light we are seeing is the light in real time from when it escaped the gravity field of the stars that created them. Hence when space web looked at the most distant stars they found then to be too young to even have their light reach here yet.
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