I believe this idea more and more lately thanks to countless History Channel and other science channel episodes.  I believe life was seeded on Earth from comets (pretty obvious now) and that we share the same genetic makeup as all life in the universe.  I believe bipedal forms are among the top of evolution.  If you look at dinosaurs most of the top predators/ smart dinosaurs were bipedal (Raptors).  So if the asteroid didn't hit that wiped them out then we would have educated lizard men walking around sort of like (Soul Calibur 2 character). 

Here is the part that has me believe this theory even more...  I remember watching a History Channel episode awhile back talking about humans and space exploration which they then went into talking about what would happen to humans during long space travel.  Guess what?  They pretty much ended up looking like how we imagine aliens looking like today (grey, small body, big head, etc).  So either aliens are humans from the future or they are from a different planet / galaxy.  I believe they came from other planets but I just threw the from the future in there for the hell of it.  We are related through the same amino acids or bacteria.  The amino acids or bacteria that started life on this planet has started life on other planets.  Think of comets as God's sperm that float around fertilizing eggs (suitable planets).   Anyways, I just wanted to discuss this considering I am fascinated with the Universe. 

I also like the ancient aliens theories discussed on History Channel.  http://www.history.com/shows/ancient-aliens/articles/ancient-alien-theory

I doubt it. Assuming aliens do exist, I couldn't imagine being from Earth. Why would they leave Earth without leaving any records of their flight?

Because they were published by EA.

My main point was that they lost their "human" features.  I just threw the part about being from the future in there for the hell of it.   I believe more in them coming from another galaxy and losing their original form (turning into grey, little body/big head aliens).

I believe that we would have evolved seperately, but a shared seeding from cosmic materials isn't entirely unplausible, possibly as a trigger for development.

That said alot of the shows on the History Channel wouldn't exactly stand up to academic scrutiny, and the "experts" on shows are abit questionable.

I'm on day #2 without any.   I did however discuss this with one of my friends while smoking.  I felt one with the universe when I came to realization.

It's not so much a question of whether we all originate from the same elements, cause we obviously do, but it's a question of whether that is a relevant criteria for saying we are evolutionarily related. Because even inanimate things all originate from the same elements as animate living things.

About your bipedal theory being true, I think that kind of species may be more abundant, because it is a simpler biological form that requires less long term evolution. A worm like species with no "pedals" would be even simpler, and to me it's no coincidence that many microscopic bugs and bacteria are as such, with no "pedals." And they are probably the most kind of abundant species.

That being said, I think long-term evolution species, things that require a lot of time and a long chain of evolutionary progress, are the most adaptable and that is why they will have more "pedals." The most adaptable species may not be the most abundant species in the universe, but they may end up being the most culturally and technologically advance species, and will probably end up being the most migratory and imperialistic species - just look at how much we have migrated and imperialized in a fraction of the time that the dinosaurs existed.

A big problem is that we haven't been around long enough to know whether a long-term evolutionary species like ourselves will survive long. We have to wait, and I'll be dead in the next 80 years.

I believe all life in the entire universe has the same genetic makeup/ building blocks.  The bacteria that seeded the Earth isn't any different than the bacteria that started life on other planets.

I'm saying they looked like humans before they started space traveling.  Anything that proves it?  No, since we have yet to even leave our solar system (let along make it to another planet, talking about humans of course not things we've sent out).  However, being exposed to zero gravity for multiple generations would eventually change how the offspring would look.  You would only need grey as your color since you aren't exposed to the sun.  You wouldn't need a big body in space to move things around.  You would mainly just need your brain.  Thus the big heads and small body that our aliens have.