The first thing that needs to be clarified is that angels are advanced human spirits who act to provide guidance for the physically living. They interact with our own spirits and as I have been posting, both are physically real entities based in the second tier of matter whereas we are based in the third tier of matter.
However, it is also obvious that alien beings also have the capacity to operate as a second tier entity as well. This nicely explains the whole of the abduction experience reports that fill the UFO literature. It is also clear that we have similar abilities that are poorly developed.
The bulk of all conscious existence is in the form of second tier spirit bodies. Our third tier existence is the exception rather than the rule.
This report continues to discuss what is known or presently surmised.