- Whilst sitting still, in London say, I am travelling at 650mph because of the Earth's rotation (if I were sitting on the equator, that would be 1,040mph).
- I am also travelling at between 65,000 and 67,000mph as Earth orbits the Sun.
- Don't forget that out Solar System is orbiting the Milky Way: at 490,000-560,000mph (feeling dizzy?)
- And our 'local' group of galaxies, relative to the cosmic microwave background, are travelling at 1.39 million mph. Phew.
So, depending on the reference frame you choose, while apparently sitting motionless you can reasonably be described as travelling at anything from 0 mph to well over a million mph. Hold on to your hat...







