Since Heaven is on a spiritual realm and we're in a physical one, I doubt extraterrestrials are angels. Since God is the ultimate creator who knows all, it's a curiosity to me why he'd create Lucifer and demons.
There were fallen angels known as the Nephilim in bodies mating and bearing children with our women. Man's every thought became evill, and this is what led to the Flood.
"Annunaki in the Bible Codes- Genesis 25:32"
"Also known as Jedi, or Nephilim"
"Who were the Annunaki? They were the Watchers, Watchmen assigned to earth to watch over Yahweh's Creation in the Garden of Eden and Earth . They were created by God as perfect Angels. These Watchers rebelled against God and their assignment and a mutiny followed as they abandoned their mission to oversee humans and began to defile the women of the earth by having offspring with them. This led to a giant defect in the DNA of the offspring and an eventual almost complete contamination of the human DNA. By the time Yahweh destroyed the world with a flood because of this contamination, only one family on earth was left with pure human DNA. But even after the flood, the Watchers kept revolting and even more were punished and cast out of heaven losing their first estate and habitation, as they continued to defile women and human DNA
(Genesis 6:4) This hybridization and corruption of the human DNA is still very much a part of our world although the giant defect has been corrected and most hybridization goes undetected. Why is the church silent on UFOs, Aliens, abductions, implantations, and forced breedings?"
source:
Annunaki
Genesis 6:4.
There were giants on the earth in those days, and also afterward, when the sons of God came in to the daughters of men and they bore children to them. Those were the mighty men who were of old, men of renown.
NKJV Scholastic Commentary: The
sons of God refer to a different group from either the men or their daughters. The phrase clearly means "angels." Job 1:6 presents Satan and his angels coming into the presence of the LORD for an audience with His Majesty. Satan's angels are there called "the sons of God," with the suggestion that these angelic beings were ounce holy ones who served the Lord, but were now allied with the evil one. Genesis assumes the existence of the good angels of the Lord (see 3:24) and of Satan and his angels, it also assumes that the later are already fallen and under God's judgment (see 1:2). In 3:1, the serpent (Satan) was already as the father of lies (John 8:44). Here it appears that some of Satan's angels, spirit beings, took on human form (see 3:24) and, out of a perverted lust, seduced women. In response, God reserved these angels for special judgment (2 Pet 2:4; Jude 6) and cleansed the earth itself (with the Flood).