Here is a mix of good and bad news.
The good news: contrary to popular panic, the Earth will probably never get swallowed by the sun.
The bad news.
Well, the bad news is that none of us will be here to witness it.
For a long time, astrophysicists had a specific narrative ready to go. Roughly five billion years from now, the star at the center of our system runs out of hydrogen. It swells. It turns red. And eventually, it shrinks down to a white dwarf, cooling off slowly for eons. The big question was always what happened to the middle child planet during the expansion phase. Did Earth spiral in and vanish? Or did it keep orbiting long after becoming a radioactive, scorched husk until the universe froze over?
Everyone bet on the spiral-in. The new study, published in Astronomy & Astrophysics, says those bets were wrong.
We might survive the expansion after all.
Inside The Burning Ball
You can’t understand the fate of the planets without understanding the engine. The sun is currently in its “main sequence.” Stable. Reliable. It’s been burning hydrogen into helium for 4.5 billion years without skipping a beat.
It won’t last forever, of course. The star gets hotter over time. Brighter. More energetic. Within the next two billion years, that extra brightness will boil away the Earth’s oceans. We’re doomed long before the big finale anyway, but the physical structure of the planet? That’s a different story.
When the hydrogen fuel finally runs dry—five billion years out, remember—the core collapses. Gravity takes the wheel. The helium core contracts and heats up, sparking fusion in a shell around it. This causes the outer layers to balloon outward while the surface temperature drops. That’s how a star goes yellow to red.
The “red giant” phase begins. And this is where things get messy for terrestrial planets.
The Tug-of-War
Think of it as a cosmic wrestling match.
Two forces are pulling on the Earth’s orbit.
First, mass loss. As the sun becomes a red giant, it sheds material via stellar winds. Less mass means less gravity. With the gravitational grip weakening, Earth should theoretically drift farther away.
Then, the drag. The expanding sun is huge. Its atmosphere is vast. As Earth passes through or near these outer gaseous layers, there is friction. Tidal forces come into play too—gravitational tugs on the near side versus the far side of the planet acting as a brake. This steals orbital energy. If these tidal forces win, Earth spirals in. Vaporization follows. Simple, tragic, inevitable.
For decades, science assumed the tides won. We were cooked.
A Change In Perspective
New modeling changes the script. The researchers looked closely at tidal dissipation—that mechanism which turns elliptical orbits into circles while draining energy. Previous models suggested it was incredibly efficient at pulling planets down. New calculations suggest it’s weaker than we thought. Much weaker.
Then there is the observational evidence. Look at L2 Puppis. It’s a red giant sitting 209 light-years away. Observations show stars like our sun lose massive amounts of mass during this transition. Enough mass that the outward drift effect might outweigh the inward tidal drag.
If the new mass-loss models are accurate, Earth’s orbit expands. It moves away from the danger zone.
Does it survive intact? No.
It will be a dead rock, barren and hot, circling a dying star. But it won’t be consumed.
The Rest Of The Neighborhood
We are still in the gray zone, obviously. Stellar winds are tricky. Thermal pulses in a dying star are unpredictable. If the sun loses less mass than the L2 Puppis models predict, the tides win again. Earth dies in fire. It is an open question.
The fate of our neighbors is not up for debate, though.
- Mercury and Venus : Gone. Swallowed completely. No second chances there.
- Mars : It will survive. It will migrate outward, away from the heat. It will be hot, yes—its polar ice caps will vaporize instantly—but it won’t be destroyed physically.
- Jupiter and Saturn : Their moon systems get interesting. Intense radiation might melt the ice shells on Europa and Enceladus. Oceans of liquid water, temporarily exposed or formed, might exist on their surfaces.
Consider that for a moment. While Earth bakes into a wasteland, Jupiter’s moons might become the new habitable frontier. For a short window, at least, life—either native or artificial—might have a second chance far out in the dark.
At least for a short time.
Until the light fades completely. 🌌
