A drop of water under a microscope with all the small microorganisms inside that are made from smaller atoms and particles- thats us. they are just as clueless and unable to see us in our dimension as we are unable to see outside of the observable universe. If the U is donut shaped it could be equal to a hemoglobin inside a vein or a molecule in a drop of fluid in a sea. We cannot ever perceive whats beyond the same way another intelligent being living in a particle inside one bacteria in the ocean could never perceive a whale thats swallowing it.
Why are there scientists disproving if the findings are showing positive results by themselves. It isn't as if they found a planet in the right place and that he is jumping to conclusions 😕
The alien life would probably be microbes that are similar to earths bacteria and some incredibly new microbes we haven't discovered yet and even some jellyfish-like, worm-like or even fish-like organisms.