What Is The Lifespan Of Our Planet

If the brightness of our star increases by 10%, the earth will no longer be in the habitable zone surrounding our star. When the Sun stops burning hydrogen in its core, Mars will be outside our habitable zone and we will be too hot to keep water on our surface. Like all things in the universe, our planet Earth will fizzle out.

Scientists estimate that our planet Earth will go out in five billion years when the sun loses its energy and is swallowed up by most of the solar system. Some scientists believe that the Earth will perish because the suns "existential tricks will consume all life on our planet. Earth's expiry date is five billion years from now, when the sun will expand and devour the planet.

As the sun ages it is expected to brighten and heat up, increasing the Earth's surface temperature and splitting carbon dioxide in the atmosphere. An oxygen-rich atmosphere is one of the defining features of the Earth, a vital gas that accounts for about 20 percent of the air. A new study has found that Earth's atmosphere will lose most of its oxygen in one billion years, with important implications for the search for life on other planets.

Researchers have calculated that this will result in a reduction of the amount of carbon dioxide in the atmosphere as CO2 absorbs heat and disintegrates. They say the Earth's atmosphere will keep high oxygen levels for billions of years before returning to lower levels reminiscent of the known Great Oxidation Event 2.4 billion years ago. One of the key reasons for this is that our sun gets hotter with age and releases more energy.

When a sun-like star turns 10 billion years old it runs out of hydrogen and expands to 100 to 200 times its current size. Planets undergoing this rapid greenhouse effect will end up looking like Venus.

Researchers have calculated that planets will leave the sun's habitable zone in about 17.5 billion years. The latest models predict a total lifespan of 6.3 to 7.8 billion years for Earth's habitable zone, suggesting that life on the planet could be about 70% of its way. Another method for calculating a planet's habitable lifespan is to identify other planets that might be able to support life.

Other planets that form on the outer boundary of a star's habitable zone and live in low-mass stars have a lifespan of 4.2 billion years or longer. Habitable planets do not get much older, as they exhaust their geothermal heat and do not have a protective geomagnetic field. Earth is 4.5 billion years old but scientists argue that the sweet spot for life on a planet could be five to eight billion years older.

S mass is expected to maintain its internal heating, its radioactive decay and its strong gravity, and to maintain an atmosphere for a long period of time.

Conditions for complex life, including humans, become untenable once a planet enters the hot zone. The evolution of complex life on this planet suggests that it would have taken a long time. Fossil records tell us that life on Earth was wiped out on our planet sometime in the last 3.5 billion years.

Many catastrophic events await the planet Earth as we know it in the future, but so far it has survived most of them. In the 3.5 billion years since then, life on Earth has been wiped out, frozen, eaten up by space rocks, mass poisoning and deadly radiation. New research suggests that Earth traveled from the solar system's habitable zone to its hot zone 1.75 to 3.25 billion years ago, scorching its oceans.

Solar-like stars give habitable planets more time to cling to water and give life a chance. Planets with greenhouse gases, particularly water vapor, carbon dioxide and methane, have become villains in global warming scenarios, but they are crucial to habitable worlds because they act as an insulating blanket in the atmosphere, absorb and emit heat radiation and keep the surface warm.

Kirschvink and his colleagues, Yuk L. Yung, Caltech professor of planetary science and PhD students King Fai Li and Kaveh Pahlevan, say that the solution is to reduce the atmosphere-wide pressure by removing enormous amounts of molecular nitrogen, a non-reactive gas that accounts for 78 percent of the atmosphere. As the sun has matured over the last 4.5 billion years, it has become brighter and hotter, increasing the amount of solar radiation the earth receives and thus the surface temperature. The Earth has managed to reduce the amount of carbon dioxide in its atmosphere, thereby reducing the warming effect.

The researchers believe the Earth's magnetic field, which deflects ionizing particles from the sun, would wear down its atmosphere. By contrast, craters formed by volatile sedimentary rock would send clouds of climate-altering gases into the atmosphere, potentially triggering a global mass extinction.

Depending on the dynamo, the magnetic field on Earth decays over a relatively short period of about 10,000 years. If the researchers are right, if the magnetic fields on our planet are lost, life on Earth would die out. Loss of the field would increase the erosion of light elements such as hydrogen from the Earth's atmosphere into space, which would lead to less favourable living conditions.

Plants that use C 4 for photosynthesis have been able to survive 0.8 billion years, but a prolonged rise in temperature of 12 billion years will make the biosphere untenable. The water on Earth will evaporate to the point where the planet remains under the same conditions, but there will be a steady rise in surface temperature as the Sun becomes a red giant. At this point, what is left of life is wiped out by extreme conditions.

The rising temperature will allow the atmosphere to escape in space and remove the shield that deflects the planet's radiation from the sun and other stars. When the temperature rises to the boiling point of water, the problem of preserving life becomes visible, since life as we know it requires water.