Mats Esseldeurs was staring into the fiery end of our solar system when he found a lifeline for Earth. According to his team’s new astrophysical models, our planet may just escape being swallowed by the Sun in five billion years—a fate long considered sealed. For decades, scientists believed that as the Sun exhausts its hydrogen and swells into a red giant, then later an AGB star, its growing gravitational pull would drag Earth into a fiery demise. But the story is more nuanced than that. As the Sun expands, it will also shed mass at an accelerating rate through stellar winds, effectively pushing Earth outward. “Earth’s fate depends on a delicate balance between these two effects,” said Esseldeurs, lead author of the study from KU Leuven in Belgium. “If tidal interactions predominate, Earth is engulfed. If the Sun’s mass loss predominates, Earth escapes into an orbit larger than the radius of its star.”
This shift in understanding hinges on better modeling of tidal dissipation within giant stars—something that has advanced significantly over the past 15 years. Earlier models overestimated how much energy tidal forces would transfer, pulling Earth inward. The new simulations show that dissipation is lower than previously thought, tipping the balance in Earth’s favor. The team also looked to the skies for real-world analogs, focusing on L2 Puppis, a star about 208 light-years away and often described as the Sun’s “old cousin.” Observing how this star loses mass helped refine their predictions.
The implications are profound. While Mercury and Venus won’t be so lucky—both destined to be consumed by the expanding Sun—Earth and Mars could survive the cataclysm, drifting into safer orbits. After the Sun sheds its outer layers, it will collapse into a dense, cooling white dwarf, no longer capable of fusion. Life on Earth will have vanished long before this final act, scorched away by increasing solar radiation hundreds of millions of years earlier. But the planet itself? It may endure.
This isn’t a reprieve for life as we know it, but it reshapes our cosmic narrative. Earth, a fragile blue dot today, might one day become a silent, barren witness to the Sun’s quiet afterlife. As science continues to refine our understanding of stellar evolution, one thing becomes clearer: even in the face of cosmic destruction, there’s room for surprise.