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قديم 14.09.2010, 07:06

د/ عبد الرحمن

مدير المنتدى

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د/ عبد الرحمن غير موجود

الملف الشخصي
التسجيـــــل: 05.08.2010
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نقلا عن
http://en.wikipedia.org/wiki/The_Earth
قسم
future

The future of the planet is closely tied to that of the Sun. As a result of the steady accumulation of helium ash at the Sun's core, the
star's total luminosity will slowly increase. The luminosity of the Sun will increase by 10 percent over the next 1.1 billion years (1.1 Gyr), and by 40% over the next 3.5 Gyr.[118] Climate models indicate that the rise in radiation reaching the Earth is likely to have dire consequences, including the possible loss of the planet's oceans.[119]
The Earth's increasing surface temperature will accelerate the
inorganicCO2 cycle, reducing its concentration to the lethal levels for plants (10 ppm for C4 photosynthesis) in 900 million years. But even if the Sun were eternal and stable, the continued internal cooling of the Earth would have resulted in a loss of much of its atmosphere and oceans (due to lower volcanism).[120]After another billion years the surface water will have completely disappeared.[121]
The Sun, as part of its solar lifespan, will expand to a
red giant in about 5 Gyr. Models predict that the Sun will expand out to about 99% of the distance to the Earth's present orbit (1 astronomical unit, or AU). However, by that time, the orbit of the Earth may have expanded to about 1.7 AUs because of the diminished mass of the Sun. The planet might thus escape envelopment by the expanded Sun's sparse outer atmosphere, though most (if not all) existing life will have been destroyed by the Sun's proximity to the Earth.[118]







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