How Time Dilation Killed 14-Billion-Year-Old-Universe Concept
<p>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 very distant objects like they were in the past, when light from them was emitted or reflected, and only 14 or 32 billion years later it came to us. Everything is slow there, even light. How do we see that light is slower there? Light is a wave (electromagnetic wave), and any wave has frequency and wavelength. The slower the wave, the lower its frequency and the longer its wavelength. The lower frequency (or longer wavelength) light is redder: red light has lower frequency than blue light, infrared even lower, … The farther telescopes look, the redder the Universe appears.</p>
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