From Mars to the Stars: James Wray Wins Simons Fellowship to Study Interstellar Objects

In 2017, a long, oddly shaped asteroid passed by Earth. Called ‘Oumuamua, it was the first known interstellar object to visit our solar system, but it wasn’t an isolated incident — less than two years later, in 2019, a second interstellar object (ISO) was discovered. 

“‘Oumuamua was found passing just 15 million miles from Earth — that’s much closer than Mars or Venus,” says James Wray. “But it was formed in an entirely different solar system. Studying these objects could give us incredible insight into extrasolar planets, and how our planet fits into the universe.”

Wray, a professor in the School of Earth and Atmospheric Sciences at Georgia Tech, has just been awarded a Simons Foundation Pivot Fellowship to do just that. Pivot Fellowships are among the most prestigious sources of funding for cutting-edge research, and support leading researchers who have the deep interest, curiosity and drive to make contributions to a new discipline.

Wray has primarily studied the geoscience of Mars. He will leverage knowledge of nearby planets to understand ISOs and planets much farther away. “I want to understand how planets got to be the way they are, and if they could have ever hosted life,” he explains. “Extrasolar planets give us many more places to ask those questions than our solar system does, but they're too distant to visit with spacecraft. ISOs provide a unique opportunity to explore other solar systems without leaving our own.”

The Fellowship will provide salary support as well as funding for research, travel, and professional development. “Seed funds like this are so valuable,” says Wray. “I’m incredibly grateful to the Simons Foundation. I’d also like to thank Georgia Tech for its support,” he adds, sharing that the Center for Space Technology and Research supported a related research effort at the University of Hawaii earlier this year. “My mentor and I were able to spend some of that time improving our Pivot Fellowship proposal, which played a critical role in securing this Fellowship.”

In search of ISOs

Wray will study small solar system bodies like asteroids and comets to decode the processes of planet formation and space weathering, and will analyze data from the 2017 and 2019 ISOs.

He will also work alongside collaborators including Karen Meech of the University of Hawaii, who led the paper characterizing ‘Oumuamua, to conceptualize what an intercept mission might look like. 

“We still have a lot of questions regarding ISOs,” he says. “Hundreds of papers have already been written about them, but we still don't know the answers.” One key mystery is the composition of the bodies: both the 2017 and 2019 objects were compositionally different from those in our solar system.

“Are they inherently different from the bodies in our solar system, or did the long journey to our solar system make them that way? Is our solar system different from others?” Wray asks. “We could answer so many questions with even a simple picture of the next ISO that comes close enough for us to intercept with spacecraft.”

A cosmic timeline

While there is no guarantee that another ISO might be spotted in our solar system, the timing is opportune — upcoming telescope surveys are poised to detect such interstellar objects. “In mid-2025, when I will start this Fellowship, the new Rubin Observatory will begin scanning the entire sky,” Wray says. “It has the potential to discover up to several new ISOs per year.”

“ISO visits are always brief,” he adds, “so the research needs to be in place for when one is spotted.” If an interstellar object is detected, Wray and Meech will be poised to leverage specialized telescopes in Hawaii, along with others worldwide, to better understand it, studying its size, shape, and composition — and potentially sending spacecraft to image it.

“We might never find another ISO — or they might be the key to imminent breakthroughs in understanding our place in the galaxy,” Wray adds. “I'm extremely grateful to the Simons Foundation for the flexibility to pursue this research at whatever pace the cosmos allows.”