The earth is only about 4 billion years old. What we call a year is how long it takes for the earth to orbit the sun.
How can they know how long anything took to travel anywhere before the earth existed?
The Speed of Light is a constant in a vacuum.
Close objects like stars can be measured with basic geometry using the PARALLAX method. Observing the star’s apparent shift in position from different parts of the Earth’s orbit.
Galaxies are much farther away and require using the Red Shift of it’s light to measure the distance. The farther away it is the more Red Shifted its light will be. Certain elements produce dark lines in the spectrum of light, so looking at the spectrum of the light and noting how much a certain element is shifted tells you how far away it is............
How to reboot the universe.
https://images.cartoonstock.com/lowres_800/computers-mantra-it-tech_support-it_workers-computer_issues-CS553085_low.jpg
The big switch.
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The Earth is not billions years old. It’s thousands of years old.
