Not just space aliens, OUTER space aliens, from the planet Kryton most likely. We just lost all our powers after the war lord Luther figured out how to alter our brains and make us weak. This all happened billions of years ago of course, and after Luther was defeated in a great revolt, we’ve been barely existing for billions of years, rising up once in a while to great civilizations, then wiping our selfs out to near extinction, over and over again. It’s part of that Luther programing in our brains.
Or, those meteors originated from earth to begin with, which is most likely.
Lord Luther is a myth construct, as is King Arthur, son of Uther Pendragon.
“Lord” is a redundancy, as the “L” in “Luther” is a corruption of El, meaning Lord.
“Luther” itself is a corruption of El-Uther.
This marks him as a Krypton related to the lords of the R-Turd clan, which is hereditarily opposed to Jor-El, whom we know is not just a Kryptonian, but a Kryptonian Science Lord...i.e. a 'wizard'.
Kal-El and El-X (an atificially genetically enhanced experimental model of Kryptonian) continue the ancient rivally on Earth, known to us as Clark (Kal-El) Kent and Lex (El-X Uthur) Luther.