It is quite possible for humans to incarnate on other planets in between lives on Earth. It is also possible for ETs to incarnate here for a life and this has occurred many times throughout history. However there is a group of beings who make up the human race and these are the ones who make up the vast majority of people here.
Some people who have recently incarnated on other planets may have strange memories of such a place and know very well that it was another planet. They may be able to telepathically connect with beings from the other planet or may be visited in dreams by these beings. It is not just the angels and guides that are helping us but also many ETs from many different planets and dimensions. The connections formed through a few of us having lives on other planets were to help ground some of the forces from various planets and dimensions onto Earth.
There are many ETs around Earth at the moment in various spaceships and the like. Many are in higher dimensions and so cannot be seen but there are also ships that can become third-dimensional. These ETs are mostly here to help us to shift into the 4th dimension and to see what has been happening here. We have been involved in something never tried before and the results will affect the entire Universe (see A New Mythology). So we have aliens all around us and many of you will have connections with certain groups. These groups are here to help us and use what they know about healing to help heal our subtle bodies. During meditation and sleep you may be visited by various ETs, they will help heal you and speed up your spiritual transformation.
Although most ETs are good and are here to help us there are some that are not good. If an ET comes to you and you are not sure about its intentions simply ask it “Are you of the light and working for the divine plan?”. If it is not, or does not answer, tell it to go away and it will. There are rules about free will and even the seemingly bad ETs will respect your will.