End of the Earth in Universe (part 2 of 5)

http://www.youtube.com/watch?v=H7aWB6ph5Vg
Documentary about End of the Earth, Sun and universe. The future of the planet is closely tied to that of the Sun. As a result of the steady accumulation of helium at the Sun's core, the star's total luminosity will slowly increase. The luminosity of the Sun will grow by 10% over the next 1.1 Gyr (1.1 billion years) and by 40% over the next 3.5 Gyr.Climate models indicate that the rise in radiation reaching the Earth is likely to have dire consequences, including the loss of the planet's oceans. The Earth's increasing surface temperature will accelerate the inorganic CO2 cycle, reducing its concentration to levels lethally low for plants (10 ppm for C4 photosynthesis) in approximately 500 million to 900 million years. The lack of vegetation will result in the loss of oxygen in the atmosphere, so animal life will become extinct within several million more years.After another billion years all surface water will have disappeared and the mean global temperature will reach 70 °C. The Earth is expected to be effectively habitable for about another 500 million years from that point,lthough this may be extended up to 2.3 billion years if the nitrogen is removed from the atmosphere.Even if the Sun were eternal and stable, the continued internal cooling of the Earth would result in a loss of much of its CO2 due to reduced volcanism,nd 35% of the water in the oceans would descend to the mantle due to reduced steam venting from mid-ocean ridges.The Sun, as part of its evolution, will become a red giant in about 5 Gyr. Models predict that the Sun will expand out to about 250 times its present radius, roughly 1 AU (150,000,000 km). Earth's fate is less clear. As a red giant, the Sun will lose roughly 30% of its mass, so, without tidal effects, the Earth will move to an orbit 1.7 AU (250,000,000 km) from the Sun when the star reaches it maximum radius. The planet was therefore initially expected to escape envelopment by the expanded Sun's sparse outer atmosphere, though most, if not all, remaining life would have been destroyed by the Sun's increased luminosity (peaking at about 5000 times its present level).However, a more recent simulation indicates that Earth's orbit will decay due to tidal effects and drag, causing it to enter the red giant Sun's atmosphere and be vaporized.Possible alternatives to this fate include the purposeful displacement of an asteroid from the Kuiper belt, which would repeatedly fly close enough to Earth as to enlarge its orbit, thereby preventing the overheating of its surface. The lifespan of the biosphere could thereby be extended by 5 billion years.

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[CoreFuse]

Well hopefully ill be dead when one comes.

[McBuff1991]

dieing by a commet.... there is no better death :D

[THEUNKNOWNWANDEREMAN]

It just had to be on Friday the Thirteenth -_______-

[orhluluzx]

Who else can tell their grandchildren they die due to a falling comet? -_-"

[1234Keithrocks]

dont we have satellites with lasers to destroy them

[rayaankabir]

THE ASTROIDS NUKED DA EARTH

[WorldofWarcraft98100]

FIRE THE SPACE LAZER!

[masteruploader1998]

@funnycrazy000 Bro .. you got some HUGE spealing issues!!! O_o

[aaronid23]

6:01 can't we just try and blow it away with nuclear missiles before it hits in 7 years?

[aaronid23]

Lol! At the beginning of this video the people were walking and didn't even react to the asteroid impact that killed them.

[TylerMcGinnisJr]

@funnycrazy000 did not raed

[funnycrazy000]

The Paomnnehal Pweor Of The Hmuan Mnid.

Ins't tihs aewosme!

Aoccdrnig to a rscheearch as Cmabrigde Uinervtisy,

it deosn't mttaer in waht oredr the ltteers in a wrod are,

the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae.

The rset can be a taotl mses and you can sitll raed it wouthit porbelm.

Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.