Yes.Gal said:As the universe expands, space itself gets "stretched" and objects drift apart, like dots on elastic surfaces when force is applied. So one meter billions of years ago is two meters today, but does it necessarily mean light takes twice as long to travel this "new meter"?
Gal said:As the universe expands, space itself gets "stretched" and objects drift apart, like dots on elastic surfaces when force is applied. So one meter billions of years ago is two meters today, but does it necessarily mean light takes twice as long to travel this "new meter"?
The speed of light in a vacuum is a constant, meaning it does not change regardless of the expansion of the universe. However, as the universe expands, it stretches the wavelength of light, making it appear to have a longer wavelength and therefore a lower frequency. This phenomenon is known as cosmological redshift.
No, the expansion of the universe is believed to be the fastest possible speed at which matter and energy can travel. This means that light, which is made up of energy, cannot travel faster than the expanding universe.
The expansion of the universe causes space itself to stretch, which means that the distance between objects is increasing. This means that light must travel further to reach us, resulting in a longer travel time and making distant objects appear to be moving away from us faster than nearby objects.
Yes, as the universe expands and stretches the wavelength of light, it also affects its color. This is due to the fact that color is determined by the frequency of light, and as the frequency decreases, the color shifts towards the red end of the spectrum. This is known as redshift.
The expansion of the universe is a crucial factor in determining the age of the universe. By measuring the rate at which the universe is expanding and extrapolating backwards, scientists can estimate the age of the universe. This method, known as the Hubble constant, is currently one of the most accurate ways to determine the age of the universe.