Photographic cameras on spy satellites supposedly can read the license plate of a car on the ground.
About how far apart would you estimate the digits on a license plate are? If the satellite orbits at a height of 160 km, about what angular resolution would you estimate is required to read the license plate? How large is the diameter of the camera required for such a feat?
What are the fundamental particles of lepton and quarks? How many are known thus far?
