I believe that there probably is other life out there. There is a project at Berkeley that the public can join on to listen out for it: https://seti.berkeley.edu/
what do you mean by an alien? Do you mean a life form comparable to us but on another planet?
I believe for example that there are probably bacteria like lifeforms may be even in our soar system, and some people think that DNA may origionally have evolved on Mars
At the moment our understanding of life obviously comes from our experience of life on Earth and so we are concentrating our efforts to look for life in Earth like situations, for example liquid water. Because of this many scientists think th ebest hope of finding life in our solar system would be Jupiters moon Europa.
However, may be life exists in a very different form to what we are familiar with and would recognise. Two fields that try to investigate aspects of this are astro and xeno biology:
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