Prispevek - is it correct ?

Potreboval bych vedet, jestli je tento kus prispevku bez chyb. Je to dost dlouhe, tak snad bude nekdo tak hodny, a mrkne na to. To uplne na konci v zavorce bych rad vedel, jak (do)prelozit. Diky predem

If we ever meet any aliens in this really big space, they will be probably so different for us that we won't be able to recognize them.
Why? It's simple. So, for example: We have five senses which help us to live. Ok, let's assume that the aliens have these same senses that we have.
We see. Why we see ? Because of our eyes. Our eyes can distinguish wavelength from about 400 to about 780 nanometres. If something has longer wavelength, we don't see it. So, what if the aliens' eyes can distinguish wavelength from 0.8 to 2 metres ? They won't probably be able to see us as well as we them.
This is just one possible problem (which can be if they have the same senses that we have, however, they probably don't). However, there are too much problems that can be, because they can be (and they probably are) absolutely different (oproti nám).

too many problems, different than us
Ok, let's assume that the aliens have these same senses that we have.
have these same senses as we do
which can be if they have the same senses as we do, however, they probably don't).

Diky moc. Jen by me jeste zajimalo, proc nemuze byt „same senses that we do“ (proc ne „have“, ale „do“ je mi jasne, ale podle me by to mohla byt i vztazna veta, ne?).

A toto je spravne: „They won't probably be able to see us as well as we them .“. Tim jsem si totiz nebyl vubec jisty 

//jo, a jeste bych prprosil nekoho o preklad toho „oproti nám“.

dívej, oproti nám by šlo říci: in contrast to us, against us, opposite us (místně)
ale s tím different se používá from či than
jj, mohlo by být i to s tím that
s tím do je to více anglické

Jj diky, verim ze s tim as je to vic anglicke, jen jsem se chtel ujistit, jestli neco nemam naucene spatne