Our Universe is finite, not infinite. Unimaginably large I grant you, but still finite. Sorry.

blah, whatever, poor choice of words.  You know what I mean.  :-p

Though I'm pretty sure space is infinite, it's just the extents of the space created by our big bang is finite.  There's nothing that says there couldn't have been another big bang elsewhere that we just can't see.

People need to get over crop circles. We sent radiowaves, so they reply in corn? We are advanced enough to send out coded messages through waves in outer space and they reply by smashing some corn in the country side? Not only is that incosiderate to the farmers, it also seems like some sort of condoscending joke. Like me sending messages to hillbillies by means of beer bottles because thats the only way those damn morons will read it.

Why not just send back a radiotransmission? That would be a hell of alot easier and people might actually pay attention, or better yet just show up, hand us a damn letter. That would get some attention. But no, it's squiggly lines that are supposed to be "DNA", random cool looking designs that are supposed to be molecules that can't be deciphered but "are very important" according to that guy, and then coded ASCII text. I mean what the fuck? If you're going to send ASCII text, just leave the damn text. If intelligent life wanted to contact us, they wouldn't be mysterious elaborate idiots about it. That just reeks of smart computer nerds in the country side with a bunch of friends. Arguing from the point of incredulity doesn't work when what you're suggesting is far more ridiculous than organized nerds with a sense of humor creating designs in corn over night. No it wasn't a flash mob, it was corn loving aliens telling us that lying is bad, and showing us the cool doodles they put on their trapper keepers in space school....I mean 3 dimensional molecule diagrams.

But the question at hand here is "Do Aliens Exist?" and not "Do you think Aliens Exist?".

Who would've heard the transmission?  Not you, not me or anyone else reading this thread.  The only people who are capable, most likely, would have kept it a secret.

How better to get the word out to as many people as possible? (Billboard) They may have taken into consideration that our various governments are already compromised.  It could also serve as a demonstration of what they're capable of.

Tell me how a flash mob of nerds are going to replicate these characteristics - while avoiding abrasion marks on the stems:

1. Enlarged (both laterally and longitudinally) plant stem nodes -- Node elongation (stretching) was a permanent effect related to the formation energies, and this is the parameter now used.

2. Marked bending of the plant stem nodes which occurs at the 1st node and 2nd nodes beneath the seed-head, or even the 3rd and/or 4th nodes down the plant stem.

3. Expulsion cavities -- holes blown out at the plant stem nodes -- usually found in the 2nd node beneath the seed-head.

4. Stunted, malformed seeds and germination effects. There are four basic changes to the seeds and germination capability in crop circle plants documented so far. These radically different reproductive effects depend upon the species of crop involved, the growth phase of the plants at the time the crop circle occurs, and the composition and intensity level of the energy system involved (which appears to differ from event to event):

a. Plant will continue to develop normally but seed development ceases when the circle is formed prior to development of the seed in the plant.

b. Seeds will be visually smaller, will weigh less and will exhibit repressed germination when the crop circles occur at a slightly later growth stage

c. Seeds will be visually stunted and will weigh less than normal when crop circles occur in more mature plants, where the embryo is fully formed or nearly so.

d. Seeds exhibit a massive increase in growth rate when crop circles occur in mature plants with fully formed seeds. These seedlings can tolerate extreme stress (lack of water and/or light) for considerable periods of time without apparent harm.

5. Tiny spheres of unusually pure iron are regularly found in soils from crop circle sites. These may be clusters of very small, perfectly spherical, magnetic particles.

Human nature proves that your explanation is far more absurd than what I assert.  If any one those were man-made, AT LEAST ONE person involved in that (if not the ringleader him/herself) would have come forward to brag about it.  Anyone capable of organizing and executing such a thing would probably be as conceited as they are gifted.

You show me God then i'll believe you.

Oh yeah, of course there is more than just our Universe. I would imagine that our universe is one amongst an immeasurable amount of other Universes existing across a vast membrane. I don't think infinite space isn't something I would subscribe to though.

Aliens would exist within the universe. God would exist without.

Big difference.