Our Solar System Is Terminally Unstable

A set of recent studies revises several long-standing timelines and environmental histories. Molecular-clock analyses that re-evaluate maximum age calibrations using deposits from China’s Weng’an and Mongolia’s Kheseen suggest animals may have originated in the Tonian roughly 800 million years ago - well before the Ediacaran fossil minimum of 574 million years - implying early metazoans survived global “Snowball Earth” glaciations. Geological work tracing quadrupolar sea-level signals shows episodes of rapid true polar wander over the past 320 million years that shifted poles by thousands of miles in geologic time, making polar drift an episodic driver of sea-level and environmental change. Atmospheric modeling for warm, wet Mars (3.6-3.8 billion years ago) finds formaldehyde deposition concentrated over water bodies, indicating that rain-delivered organics could have seeded basins hospitable to prebiotic chemistry.

A focused astrophysical simulation argues the solar system’s long-term stability is far shorter than once thought. By modeling stochastic solar mass loss during the Sun’s red-giant transition, researchers find that the dying star’s mass loss can perturb planetary orbits enough to trigger “terminal instability,” likely destroying or ejecting outer planets within a few billion years and leaving the system largely unraveled within about six billion years - far sooner than previous estimates of ~100 billion years. The study concludes that the Sun’s own death, not slow chaotic diffusion or passing stars, is the dominant threat to the planetary architecture.