To be able to see through something means being able to see what is on the other side or inside of it. It can also refer to being able to perceive the truth or hidden elements behind a situation or a person's actions.
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Yes, if you could see through everything, you would not be able to see anything specific because your vision would extend through all objects without stopping at any point to focus on any particular thing. It would be like having a continuous view without the ability to distinguish individual objects.
We are able to see the Moon, other Planets and even the Sun. The Sun make this possible through its light, even at night. With the help of a powerful telescope we are able to see distant galaxies, distant stars that don't exist anymore, we are seeing only its light which is still travelling.
Echolocation is how bats "see". It is basically the act of making a noise and using the returning soundwaves to determine where something is - it is essentially using echoes to locate something.
Dust particles while small reflect light, thenceforth you are able to see individual particles as they turn through the air.
if you mean opaque, it is a translucent colour that you cannot really see through, as an example a pearl would be opaque