A new simulation study finds the outer Solar System could break apart roughly 1 billion years after the Sun becomes a white dwarf, not the 10^18 years previously estimated. The change comes from modeling the Sun's mass loss as random bursts rather than a smooth process.
Researchers at the California Institute of Technology have published new simulations suggesting the Solar System's outer planets will become dynamically unstable far sooner than previous models predicted. The study, led by Konstantin Batygin along with Jim Fuller and Fred C. Adams, appeared in The Astrophysical Journal Letters (volume 1009, article L22) under the title "Terminal Instability of the Solar System Triggered by Stochastic Solar Mass Loss."
What the study actually found
The team ran hundreds of N-body computer simulations tracking the gravitational interactions of Jupiter, Saturn, Uranus and Neptune as the Sun evolves into a red giant and later a white dwarf. According to AAS Nova's summary of the paper, about 40% of the simulations showed the outer planets' orbits becoming disrupted during the red giant phase itself, and 90% showed disruption within 3 billion years of white dwarf formation. Overall, the paper concludes the outer planets are unlikely to survive more than roughly 1 billion years after the Sun becomes a white dwarf.
Why the estimate changed so much
Earlier stability studies assumed the Sun would lose mass smoothly and gradually as it ages. Under that assumption, prior work had estimated the outer planets could remain stable for 30 to 100 billion years, or by some estimates as long as 10^18 years, according to AAS Nova and 404 Media. The new paper instead models the Sun's mass loss as a series of random, asymmetric "stochastic kicks," based on observed recoil velocities of white dwarfs that imply mass is ejected unevenly rather than uniformly.
When this randomness is built into the simulations, the orbital period ratios of the giant planets drift unpredictably over time, a process the authors describe as stochastic diffusion. 404 Media reports that this mechanism causes orbit crossings and chaos even where planets fall into mean-motion resonances — configurations in which orbital periods form small integer ratios and were previously thought to offer some protection against instability. The paper finds resonant configurations disassemble slightly more often than non-resonant ones, not less.
Previous vs. new stability estimates for the outer Solar System
Model
Mass-loss assumption
Estimated stable lifetime
Earlier studies
Smooth, gradual solar mass loss
30–100 billion years (some estimates up to 10^18 years)
New Caltech-led study (2026)
Stochastic, randomized mass-loss bursts
~1 billion years after white dwarf formation; disruption possible even during red giant phase
Timescale and what it means
Despite the dramatic reduction, the predicted instability remains billions of years away. The Sun is expected to enter its red giant phase roughly 5 billion years from now, per standard stellar evolution timelines cited by Euronews, so the newly identified instability window would still occur well beyond any human timescale. The finding revises how astronomers understand the long-term dynamical fate of planetary systems once their host star dies, rather than indicating any near-term risk to Earth or the current Solar System.
Newton's envisioned instability is real after all.
— Konstantin Batygin, as quoted by 404 Media
The quote refers to Isaac Newton's historical speculation that the drifting orbits of Jupiter and Saturn hinted the planetary order might not be eternal, an idea the new paper's authors say their simulations ultimately support, though on a timescale tied to the Sun's death rather than present-day orbital drift.
Questions
Is the Solar System actually about to become unstable?
No. The instability described in the study would occur around or after the Sun becomes a red giant and then a white dwarf, a process expected to begin roughly 5 billion years from now, not in the near future.
What causes the new, shorter instability estimate?
The researchers modeled the Sun's mass loss as random, asymmetric bursts rather than a smooth process, based on observed white dwarf recoil velocities. This randomness destabilizes the outer planets' orbits far faster in simulations than older, smooth-mass-loss models predicted.
How much shorter is the new estimate compared to before?
Prior studies suggested the outer Solar System could remain stable for 30 to 100 billion years, or by some estimates up to 10^18 years; the new study finds disruption likely within about 1 billion years of white dwarf formation, a reduction described as roughly a billion-fold.
Which planets are affected?
The simulations focus on the giant outer planets — Jupiter, Saturn, Uranus and Neptune — whose orbital period ratios were tracked as the Sun loses mass during its late-life evolution.
Where was the study published?
The paper, titled "Terminal Instability of the Solar System Triggered by Stochastic Solar Mass Loss," was published in The Astrophysical Journal Letters (volume 1009, article L22) by Konstantin Batygin, Jim Fuller and Fred C. Adams.
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