Recent stellar evolution models indicate Earth’s fate during the Sun’s late life may depend on a “delicate balance” of physical processes. In standard scenarios, the Sun eventually expands into a red giant, growing to hundreds of times its current size and engulfing the innermost planets. However, the new modeling results suggest the outcome for Earth could be different, implying that Earth might avoid direct engulfment in about 5 billion years.
Across the reports, the key idea is that competing effects—particularly how the Sun’s radius evolves compared with changes in Earth’s orbital distance—can shift whether Earth is swallowed or remains outside the Sun’s outer layers. The sources also describe this as an improvement in prospects relative to older estimates, while still emphasizing uncertainty inherent in long-term predictions. Overall, the articles present the models as refining the timing and extent of the Sun’s expansion and how planetary orbits respond during the transition from the Sun’s current stage to its red-giant phase.
