When Life on Earth Will End: Scientists Predict Exact Year

A team of NASA scientists and researchers from Toho University in Japan have used supercomputer simulations to predict the expiration date of complex life on Earth. The findings indicate that the planet’s breathable atmosphere will collapse in approximately 1 billion years.

The study, published in Nature Geoscience in a paper titled The future lifespan of Earth’s oxygenated atmosphere, utilized NASA planetary models and a supercomputer to conduct 400,000 simulations. The research determined that the atmosphere will become inhospitable long before the planet itself is physically destroyed.

The Mechanism of Atmospheric Collapse

The researchers identified the aging process of the Sun as the primary driver of this collapse. As the Sun burns brighter, it increases the amount of heat reaching Earth, which will cause the planet’s surface to warm and water to evaporate.

This increase in temperature will eventually break down the carbon cycle that supports photosynthesis. As plants die off, oxygen production will stop, causing the atmosphere to revert to a low-oxygen, high-methane state similar to the conditions of ancient Earth.

This transition will result in the suffocation of nearly all complex life, including humans, plants, and animals. However, the researchers noted that microbial life may still survive in anaerobic corners of the planet where oxygen is not required.

Revised Lifespan Estimates

For several years, scientific discussions regarding the lifespan of Earth’s biosphere were based on the steady brightening of the Sun, which led to estimates that life could persist for about 2 billion years. The new research, led by Kazumi Ozaki and Christopher T. Reinhard, suggests those previous figures were overestimates.

For many years, the lifespan of Earth’s biosphere has been discussed based on the steady brightening of the Sun. If true, one can expect atmospheric O₂ levels will also eventually decrease in the distant future.

Kazumi Ozaki

By focusing specifically on atmospheric changes and utilizing data from the NASA Astrobiology Institute, the team concluded that the timeline for a breathable atmosphere is roughly half of previous estimates, establishing a hard stop at around 1 billion years.

Cosmic Timeline and Solar Evolution

The collapse of the oxygenated atmosphere is a distinct event from the eventual death of the Sun. Scientists believe the Sun is currently halfway through a 10-billion-year lifespan.

In approximately 5 billion years, the Sun will swell into a red giant, a process that will lead to the consumption of the planets in its wake, including Earth. The supercomputer simulations clarify that the biological end of the planet occurs billions of years before this stellar expansion.

This research provides a more precise window into the natural end of the Earth’s biosphere, independent of man-made threats such as climate change or nuclear conflict.