I believe there are life on other planets. The universe is infinite how can there not be? How can we be the only life out of a gabillion galaxies? I think we may be the only life in our galaxy though.
As far as ghost, we are energy, and energy can never be destroyed even when our physical body dies, our energy is still there. I think if the energy is strong enough we can experience things we call "ghost" or else i am crazy and should be committed. The ish I have witnessed is scary as hell and if it was all in my head, HOLY CRAP!!!