A Timeline of Earth’s Final Days and Ultimate Death

5 to 7 Billion Years From Now

• The Sun Becomes a Red Giant
  The sun, having exhausted its supply of hydrogen and helium, will expand to 256 times its current size, entering its red giant phase.

5 Million Years After the Sun Becomes a Red Giant

• Mercury and Venus Get Engulfed
  The expanding red giant will consume Mercury and Venus.
• Earth’s Atmosphere Becomes Unsustainable
  Intense heat will prevent the replenishment of carbon in the atmosphere.

The Decline of Life on Earth

• Plants Die Out
  The lack of carbon dioxide will cause plants to perish. Without plants, oxygen levels will plummet.
• Mammals and Birds Die
  The drop in oxygen levels will kill oxygen-dependent creatures, leaving only organisms that can survive on minimal oxygen.
• Insects Die Out
  Rising temperatures will eventually eliminate insects, leaving behind microbial life.

The Last Survivors

• Tardigrades Endure
  Tardigrades, capable of withstanding extreme radiation and temperatures, will outlive all other forms of life.

Earth’s Transformation into an Uninhabitable World

• Catastrophic Weather Events
  Intense heat will cause massive storms and rainfall, accelerating planetary destruction.
• Surface Temperature Rises Beyond 2,400 K
  Earth’s surface will become unbearably hot, destroying all remaining life.
• Loss of Atmosphere
  The atmosphere will completely dissipate, leaving a barren, irradiated planet.

The End of Water and Geological Movement

• Oceans Evaporate
  The intense heat will boil away all water, leaving behind a molten surface.
• Tectonic Plates Cease to Move
  Without water, tectonic activity will stop entirely.

7.6 Billion Years From Now

• Earth and the Moon Are Consumed
  The sun, as a red giant, will engulf Earth and its moon.
• The New Habitable Zone
  A habitable zone will shift to the Kuiper Belt, where icy worlds like Triton and Eris will melt, potentially hosting liquid water.
• Potential Human Colonization
  With Earth no longer habitable, humanity may establish colonies on Neptune’s moon Triton, the dwarf planet Eris, and other icy bodies.

1 Quadrillion Years Later

• The Sun Becomes a Black Dwarf
  After a long journey through its stellar lifecycle, the sun will cool into a black dwarf—a cold, Earth-sized remnant of its former glory.

Conclusion

As Earth’s journey ends, the resilience of life, from tardigrades on Earth to potential human colonies in the Kuiper Belt, illustrates the unyielding persistence of existence in the cosmos. While Earth’s death is inevitable, the potential for human survival lies in adapting to new frontiers beyond our home planet.