Astronomers will now try to learn more about the moon’s orbit so they can calculate a mass for the system and learn more about how it formed.
Well, that’s how they used to think that the solar system formed (that hypothesis has been all but invalidated by recent observations of many other solar systems with planets that can’t fit that model).
However, here they are talking about the planetary system, not the solar system. In other words, they want to determine if the moon was a chunk knocked loose from the planet, or a passing object that got captured, etc.