Researchers have claimed to have found evidence about the building blocks of Saturn's moon Titan pre-dating the planet itself.
The researchers found that nitrogen in the atmosphere of Saturn's moon Titan originated in
conditions similar to the cold birthplace of the most ancient comets from the Oort cloud.
The finding has ruled out the possibility that Titan's building blocks formed within the warm disk of material thought to have surrounded the infant planet Saturn during its formation.
The main implication of this new research is that Titan's building blocks formed early in the solar system's history, in the cold disk of gas and dust that formed the Sun. This was also the birthplace of many comets, which retain a primitive, or largely unchanged, composition today.
The paper suggests that information about Titan's original building blocks is still present in the icy moon's atmosphere, allowing researchers to test different ideas about how the moon might have formed.
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Mandt and colleagues demonstrate that a particular chemical hint as to the origin of Titan's nitrogen should be essentially the same today as when this moon formed, up to 4.6 billion years ago. That hint is the ratio of one isotope, or form, of nitrogen, called nitrogen-14, to another isotope, called nitrogen-15.
The team finds that our solar system is not old enough for this nitrogen isotope ratio to have changed significantly. This is contrary to what scientists commonly have assumed.
The research was published in the Astrophysical Journal Letters.
