cajun: But if if it did, what makes us think they may be using radio waves to commaunicate, and noises like humans do?
Who says they are even in a living form, or have eyes or mouths? Muchless communicate verbally?? Maybe they are invisible? Maybe they are 1000times more advanced than us, but are a billions of times smaller that we could never see?
Of course they would. If they are Created by God in his image, they would be very similar to us.
If they evolve - they will operate on the same principals being in the universe with the same physical and chemical laws.
They will be in contact with things, able to feel local pressure so the sense of touch will be evolved early in the evolution in any multicellular organism of certain complexity.
They will contact solid things, so they will have provisions to analyse their chemical content - hence the sense of taste. A living form does not so much evolve ability to perceive chemical content as it is originally posessing it and evolves ability to isolate itself from the environment. An amoeba has no choice but to "taste" environment.
If existing in a gas athmosphere it will develop, or rather retain teh ability to feel chemical composition, hence taste of smell. It is highly unlikely for intelligence to develop underwater because the fire is impossible there.
Radiated electromagnetic energy is present on any planet where conditions for life above primitive level exist - hence it will have eyesight.
Sense of touch and sound are closely related. So they will have hearing and because of that will develop ability to use sounds. Sounds are easy to produce, do not require line-of-sight, basically extremely usefull not to evolve the use for them.
So touch, taste, smell, hearing and sight. If they have any other nice sense like electrical sensitivity like some of our fish, not a big deal.
Most of nifty organs earth life has evolved multiple times - like various types of eyes evolved at least forty times independently.
There are only so many basic principles you can base life on.
As for ET - in order for us to hear their radio signal, it should be comparable in power to a star. Why would they ever bother to undertake such a project if a recepient would receive the message, let alone reply to it in thousands of years?
miko