Astronomers have been making maps by observing a slice of the universe and seeing where the galaxies lie within that slice. if the universe is isotropic and homogeneous, why do they need more than one slice? suppose they now want to make each slice extend farther into the universe. what do they need to do?

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.