>> How can they know what the velocity was 130,009 years ago?
The same way they knew that if you stand exactly 6 feet apart you won’t get Kung Flu because it only travels 5.99 feet.
They’re SCIENTISTS. They went to college and they know molecules and math and thermoclines and stuff. So shut up and believe!
Right, they’re scientists. That’s how they know we can change our gender at will, just by wishing it so. Who needs actual proof?