The short answer to the question is No and Sometimes.
While there were some in the Contactee movement of the 1950s and 60s who described aliens as technological angels, and even some today who ascribe to an Ancient Astronaut theory that all historical mentions of angels, gods and demigods were in actuality pre-scientific encounters with extraterrestrials (which is kind of the premise of Marvel’s Thor), there is actual a couple of big differences between angels and extraterrestrial biological entities (EBEs). Three big differences include:
 While angels can take on a physical form, they are spiritual in nature. Aliens are supposed to be biological.
 Aliens are supposed to come from a planet somewhere, but the first habitation of angels appears to be what the Bible calls the Third Heaven, which is actually beyond space-time.
 Presumably, aliens are born and produce offspring because, you know, biological. Angels are immortal…
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