NASA’s Lucy mission: an odyssey to the Trojan asteroids
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So what does come next?
A more traditional explanation would argue that the planets formed in essentially the same place they are today, like plants sprouting from the soil. But there’s evidence to suggest this may not be the case: for one thing, the discovery of exoplanets — worlds around other stars — has proven that not all planetary systems are modeled like our own. Also, orbital patterns of objects in the Kuiper Belt seem to suggest that small, icy bodies and planets within it have changed place over time.
Lucy’s mission to the Trojans may support a more modern understanding of planetary formation generally referred to as the Nice Model, not because it’s cool (which it is), but because of the city in France where it was created.
This set of ideas asserts that around 4 billion years ago, Saturn, Jupiter, Neptune and Uranus used to be much closer to the Sun than they currently are. The planets started interacting with each other, leading to a period of instability that caused Saturn, Neptune and Uranus to move away from the Sun. Jupiter moved a bit closer.
Somewhere amid the chaos, asteroids moved around, too. That’s where the Trojans might have come in.
“In this model, as the planets move, they’re snowplowing all the rest of the planetary disc away,” Knoll said. “Most of that just gets lost and leaves the solar system. But one in 100,000 objects get captured instead, and a fraction gets scattered inward in the Trojans.”
OK, so the Trojans are an important part of our solar system’s timeline. But what will Lucy look for in order to answer these existential questions about the creation of the solar system and thus life as we know it?
The short answer is: we’re not sure.
Lucy will, of course, take photos and measure the mass and volume of its subjects in order to determine their densities. Much like llamas, no two Trojans are the same, so it will be important for Lucy to gather as much detail about them as possible. There could hypothetically be a link between the color of various asteroids and their densities, for example.
When it comes to the Trojans, we don’t know what we don’t know, but that’s the most exciting part.
“The question is whether we’ll find evidence that strengthens the newer version of migrating planets,” Knoll said. “The evidence is harder to say.”
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