The scale of the universe
How can we understand these distances on a human scale?
The sun is 1.5x1011 m away.
A passenger jet travels at 600 mph ~ 270 m/s
If you could fly to the sun, the trip would take…
t = d/v = 1.5x1011 m / 270 m/s =5.6x108 s = 18 years!
The next nearest star is 4.3 light-years away, 270 000 times as far.
It would take 4.8 million years to get there by jet!