Time Dilation: Astronomers Witness Slow-Motion Universe in Ancient Years

Astronomers have observed time dilation in quasars, providing evidence for Einstein's theory of general relativity. By studying the light from quasars that originated billions of years ago, the researchers found that time appeared to flow five times slower in the early universe. The expansion of the universe caused the wavelengths of light to slow down, allowing astronomers to measure time dilation. This discovery confirms that quasars are real cosmological objects and supports Einstein's predictions about the effects of the universe's expansion on the perception of time.