The discovery of the nucleobase uracil is a big step forward for astrobiology.
So it seems that RNA and DNA initially formed on Earth from nucleobases brought here by asteroid impacts and meteorite falls long ago. However, there is another possibility, which is that RNA and DNA molecules may have formed in space themselves before being delivered to the young Earth. The question mark here is that biochemists currently do not fully understand what conditions are required for RNA and DNA to form on asteroids.
Another possibility is that uracil and other nucleobases may pre-date the formation of our solar system. They may have been formed in deep space via photochemical reactions — the action of ultraviolet light on organic molecules — on ices in interstellar clouds from which the solar system, and other planetary systems including their asteroids, formed.
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