I think researchers are still looking for the common ancester of apes and humans which they are investigating weather the common ancester even came from earth or space (or at least some of our ancesters).
Not really true - there is no consideration given to the possibility of descent from space. We have quite a bit of 'hominid' (considered the common great ape ancestor) evidence. If you are interested, you can see the fossil evidence here - this includes some of the creationist arguments. The concept of the 'missing link' was mostly a media invention rather than a scientific concept.
Well to help prove my case below I have a quote directly from a recorded documentary about darwins theory which says the 'max planck institute' is researching if some of our ancesters came from space. So from 'max planck institute' point of view there is a great possibility of some of our ancesters comming from space and one day they will find proof.
At the max planck institute for evolotion and pathology in lipeson, research has been conducted for several years and dna analysis to establish the exact relationship between humans and apes. Darwins vision as I understand it would have been that there would be a single common ancester and that you can relate everything living to this common ancester and what science has done since then is fill in those details. So what do those branches look like? And which branches do humans evolve from for example? And what percentage of these branches are allocated to the different life forms on this planet? And thats something thats still evolving itself and that we're still learning about. There's a greate deal of diversity out there that we know nothing about.
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Since darwins time, theres been great interest in questions to human races. Weather humans can be classified into races and if so how can they be related and how did they come about and so fourth. What we now know on genetic evidence substanciates that at least that some of darwins own thinking even though that you have different varieties of humans or at least what appears to our eyes of different varieties that underneath, underneath the physical appearance differnces one might see that there is really nothing else different about humans...