The Human Race Will Eventually Go Extinct. It's inevitable.

The Dying of The Sun- How old is the Sun? Actually it's middle-aged. It was formed about 4,500,000,000 (four and a half billion) years ago and we expect it to carry on pretty much as it is now for a few billion years yet - so no surprises in our near future. Earth's fate Earth's ultimate fate is precarious. As a red giant, the Sun will have a maximum radius beyond the Earth's current orbit, 1 AU (1.5"1011 m), 250 times the present radius of the Sun.[106] However, by the time it is an asymptotic giant branch star, the Sun will have lost roughly 30% of its present mass due to a stellar wind, so the orbits of the planets will move outward. If it were only for this, Earth would probably be spared, but new research suggests that Earth will be swallowed by the Sun owing to tidal interactions.[106] Even if Earth should escape incineration in the Sun, still all its water will be boiled away and most of its atmosphere will escape into space. Even during its current life in the main sequence, the Sun is gradually becoming more luminous (about 10% every 1 billion years), and its surface temperature is slowly rising. The Sun used to be fainter in the past, which is possibly the reason life on Earth has only existed for about 1 billion years on land. The increase in solar temperatures is such that in about another billion years the surface of the Earth will likely become too hot for liquid water to exist, ending all terrestrial life. A star"s life-cycle depends on its mass. Stars like the Sun spend most of their lives quietly eating up the hydrogen in their centre. That means their temperature and size stay very much the same for billions of years. When the Sun is about 7 billion years old it will slowly start to change and will become bigger and cooler. By the time it is 10 billion years old it will have changed into a red giant and its atmosphere will stretch out to near where the Earth is today. The Sun will grow old in much the same way as humans do. In a few billion years time it will be unrecognisable as the Sun we know today- a bit like the difference between an 80-year old person and a photograph of them as a baby! Under-sea coral? Enchanted castles? Space serpents? These eerie, dark, pillar-like structures are actually columns of hydrogen gas and dust where new stars are being formed. This picture of the Eagle Nebula was taken with the Hubble Space Telescope. The nebula is 7000 light years from Earth and is huge - the largest pillar is about four light years from top to bottom! The Sun and stars don't seem to change much year after year so how can we know about their lifecycles? One method is to have computer programs to calculate how a star evolves as it uses up its energy resources. Another way is to observe many stars. We see many different kinds of stars and we assume the reason for this is that we are seeing stars at different stages of their lifecycle. We can then begin to build up an explanation of how and when they change. It's a bit like observing all the people in a town centre. We assume that they are all basically the same kind of animal (human beings) but that the main differences are caused by them being at different stages of their lifecycle (age). Fortunately, we don't have the complication of male and female stars! When and how will the Sun die? The Sun will not die in the way we know plants and animals die. But in a few billion years it will have changed so much it will not be recognisable as the Sun we know today. Calculations show that, as the hydrogen fuel in the core is used up, the outer parts of the Sun will begin to expand. The Sun will turn from a 'yellow dwarf ' into a 'red giant'. And it really means 'giant'! It will grow so big that it will almost engulf the Earth in its orbit. The outer atmosphere will eventually be puffed out in a gentle explosion and the Sun will be at the centre of a planetary nebula - just like this. , or maybe like the one below. Can you see the old star in the middle of that nebula? If The Sun Dies NASA If you put a steamy cup of coffee in the refrigerator, it wouldn"t immediately turn cold. Likewise, if the sun simply "turned off" (which is actually physically impossible), the Earth would stay warm"at least compared with the space surrounding it"for a few million years. But we surface dwellers would feel the chill much sooner than that. Within a week, the average global surface temperature would drop below 0"F. In a year, it would dip to "100". The top layers of the oceans would freeze over, but in an apocalyptic irony, that ice would insulate the deep water below and prevent the oceans from freezing solid for hundreds of thousands of years. Millions of years after that, our planet would reach a stable "400", the temperature at which the heat radiating from the planet"s core would equal the heat that the Earth radiates into space, explains David Stevenson, a professor of planetary science at the California Institute of Technology. Although some microorganisms living in the Earth"s crust would survive, the majority of life would enjoy only a brief post-sun existence. Photosynthesis would halt immediately, and most plants would die in a few weeks. Large trees, however, could survive for several decades, thanks to slow metabolism and substantial sugar stores. With the food chain"s bottom tier knocked out, most animals would die off quickly, but scavengers picking over the dead remains could last until the cold killed them. Humans could live in submarines in the deepest and warmest parts of the ocean, but a more attractive option might be nuclear- or geothermal-powered habitats. One good place to camp out: Iceland. The island nation already heats 87 percent of its homes using geothermal energy, and, says astronomy professor Eric Blackman of the University of Rochester, people could continue harnessing volcanic heat for hundreds of years. Of course, the sun doesn"t merely heat the Earth; it also keeps the planet in orbit. If its mass suddenly disappeared, the planet would fly off, like a ball swung on a string and suddenly let go. If the Sun dies out......... 1. The Earth would cool down to -400 C', it is evident humans or any other life forms could not survive at this temperature. 2. The Earth would lose it's gravitational attraction to the Sun and therefore plummeting to an endless abyss forever, although humans would die because no gravitational sorce is controlling Earth and we would fly away XD http://www.popsci.com... http://www.suntrek.org...