In ancient times, people believed Earth was the center of the Solar System. Which of the following makes the geocentric model impossible? The moon revolves around Earth
o Earth's gravitational force is much less than the Sun's,
0 Orbits are elliptical, not circular,
There are other planets that are closer to the Sun.

Orbits are elliptical, not circular

Explanation:

There were too many celestial objects for that model to have worked, you would have had a series of overlapping orbits that wouldn't be stable

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.