PSA: weather balloons don't have lights like that
so why should all ufos be round and have lights all around them? why is it generalized like that? the forget, you don't know what aliens are thinking. why would they engineer their ships to look like something humans think they look like?
Better question is why would they design a spaceship to not be aerodynamic if it's going to be going into the atmosphere of planets?If they fly around like nutjob conspitribals and videos claim they do, which is by zipping around up and down and in all directions, having a flat saucer is not a good design.
for all we know their planet probably could have a less dense atmosphere
Umm, the same physics still apply. And if they are intelligent enough to achieve interstellar travel, they can design an aerodynamic ship.
If aliens were to travel to earth, their atmospheric and orbital thrusters would probably run on nuclear fuel, blanketing everything behind them in the warm healthy glow of radiation.
clearly the ufo creates its own artificial vacuum around the ship which allows it to maneuver without air and water creating frictionno but i don't know why it would be designed like that