Tag: Dilation

Time ran slower in the past: at twice slower pace 14 billion years ago, at 12 times slower pace 32 billion years ago. How do we know? Because when we look into the past, we see everything there is slow. How do we look into the past? Through telescopes: because the speed of light is finite, we see ve...

Every body radiates its heat. Night vision goggles are based on that : all they do — convert lower frequency light (infrared/heat) into higher frequency visible light. The colder the body the lower frequency (longer wavelength) light it emits. Our Universe body (even a few atoms of hydrogen or...