Brief
Scientists propose extending the solar system’s edge to 3.8 light‑years
Jim Green and Ed Belbruno argue that the Sun’s gravitational reach stretches far beyond the traditional heliopause.
By Felo News Desk · Published
Two leading space scientists say the Sun’s gravitational frontier may extend to nearly 3.8 light‑years, or about 241,000 astronomical units (AU), far beyond the conventional heliopause.
What happened
Jim Green, former NASA chief scientist, and Ed Belbruno, a mathematics professor at Yeshiva University, presented their theory in the August 2026 issue of ROOM – the Space Journal of Asgardia. They argue that measurements of the Milky Way’s gravitational field, including dark matter, push the Sun’s stable region outward to a distance comparable to the spacing between neighboring stars.
What the reports add
Space.com reports that Green and Belbruno describe the solar system’s edge not as a sharp boundary but as a “complex dance among forces, energies and trajectories.” They also suggest that the Solar Lagrange points L1 and L2 could act as portals that capture slow‑moving interstellar objects, such as comet 3I/ATLAS, allowing them to become part of the solar system.
What was said
“Discovering the solar‑galactic center L1 location is important since slow moving objects that enter this region can be captured by our sun and become part of our solar system,” Green told Space.com.
“Who knows if there may be a large captured rogue planet on its way into the solar system right now,” he added.
Green said he is discussing observations of the newly calculated L1 and L2 locations with the New Horizons team, which is now operating in the outer heliosphere.
How it came about
The proposal builds on earlier Felo News coverage of solar‑system dynamics, including a 2026‑10‑01 article on potential destabilisation of the system as the Sun ages. While that piece focused on long‑term orbital stability, Green and Belbruno’s work shifts attention to the present‑day gravitational boundary and its interaction with interstellar material.
Key facts
- The proposed gravitational frontier of the solar system extends to about 3.8 light‑years (≈241,000 AU). (space.com)
- Jim Green and Ed Belbruno presented the theory in the August 2026 issue of ROOM – the Space Journal of Asgardia. (space.com)
- Green is discussing observations of the new L1 and L2 locations with the New Horizons spacecraft team. (space.com)
Sources
- [1] space.com — originally reported as “It's time to reassess the size of our solar system, scientists say”
