Oxygen makes up one-fifth of the air we breathe, but it's the most vital component – and it does seem to be declining. The main cause is the burning of fossil fuels, which consumes free oxygen. Fortunately, the atmosphere contains so much oxygen that we're in no danger of running out soon.
One billion years from now, Earth's atmosphere will contain very little oxygen, making it uninhabitable for complex aerobic life. Today, oxygen makes up around 21 per cent of Earth's atmosphere. Its oxygen-rich nature is ideal for large and complex organisms, like humans, that require the gas to survive.
The typical volume of an adult is 0.1 m3. So the people are likely to have suffocated after 7.8 104 s or 21 hours and 47 min. In reality this period may be shorter, because people exert more energy and (demand more oxygen) when the CO2 content of the air increases, because they need to breathe more heavily.
However, astronauts in the Gemini and Apollo programs breathed 100 percent oxygen at reduced pressure for up to two weeks with no problems. And you don't need to worry about ever breathing 100 percent oxygen except in rare cases.
With a spike in oxygen concentration, the atmosphere would become much thicker and scatter more sunlight, thus making our sky look much bluer. It will also decrease the temperature of the air.
Problem 3 – Which planet has the atmosphere with the greatest percentage of Oxygen? Answer: From the table we see that Mercury has the greatest percentage of oxygen in its atmosphere.
There is some uncertainty in the calculations, but recent results suggest 1.5 billion years until the end. That is a much shorter span of time than the five billion years until the planet is engulfed by the Sun. (Though still long enough that you need not change your investment strategies.)
When the earth was formed around 4.5 billion years ago, it had vastly different conditions. At that time, the earth had a reducing atmosphere, consisting of carbon dioxide, methane and water vapor, as opposed to the present-day atmosphere that consists primarily of nitrogen and oxygen.
Every living cell would explode in a haze of hydrogen gas.
Water is one third oxygen; without it, the hydrogen turns into gaseous state and expands in volume.
Earth's oxygen supply originated with cyanobacteria, tiny water-dwelling organisms that survive by photosynthesis. In that process, the bacteria convert carbon dioxide and water into organic carbon and free oxygen.
The Age of Oxygen (400 million to 290 million years ago)
Oxygen made up 20 percent of the atmosphere—about today's level—around 350 million years ago, and it rose to as much as 35 percent over the next 50 million years.
For men, the group expects they will live to be 83 to 86 instead of the government's projection of 80 years average life expectancy in 2050. S. Jay Olshansky, co-author of the report, said a few extra years life might not sound important, but it will cost us socially and financially.
Scientists have found a way to lengthen worms' lives so much, if the process works in humans, we might all soon be living for 500 years. They've discovered a "double mutant" technique, when applied to nematode worms, makes them live five times longer than usual.
The earth would become warmer, the average temperature will increase. There will be several new weather patterns and the sea levels would rise. Eventually humans would die out. If the insect population continues to decline, all birds that depend on insect for food will become extinct.
The atmosphere of the planet Uranus contains mostly hydrogen, helium, and methane. Interestingly, the methane in the atmosphere is what gives Uranus its distinctive blue color. Since Uranus contains effectively zero free oxygen, the hydrogen and methane in the atmosphere does not burn or explode.
That said, there is actually plenty of oxygen on the Moon. It just isn't in a gaseous form. Instead it's trapped inside regolith — the layer of rock and fine dust that covers the Moon's surface.
Both the atmosphere of Mars and that of Venus are mainly made of carbon dioxide. Neither planet's atmosphere contains any amounts of oxygen to speak of, which means that right now, we wouldn't be able to breathe on either planet.
Scientists say humans could be just seven years away from achieving immortality - and finding a way to live forever. Computer scientist Ray Kurzweil says immortality could be possible by 2030, reports indy100.
Lifespan refers to the maximum number of years an individual can live, making lifespan unique to everyone. The longest recorded lifespan was Jeanne Calment who lived for 122 years and 5 months, making the maximum possible human lifespan 122 years and 5 months – that is, until someone outlives Calment.
“Based on these studies, one can extrapolate that the maximal human lifespan lies between 120 and 150 years,” Verdin says. However, the longest a person ever lived was 122, suggesting the maximal lifespan is probably closer to 120.
These are natural changes that occur while aging. They cannot be stopped but it is possible to slow the rate of these processes. This can be done by changing one's lifestyle (diet, exercise, etc). The science of aging is not yet fully understood; therefore, it is difficult to determine an absolute limit of 200 years.
life expectancy in the mid-Victorian period was not markedly different from what it is today. Once infant mortality is stripped out, life expectancy at 5 years was 75 for men and 73 for women.
According to a US report, the sea level will increase by 2050. Due to which many cities and islands situated on the shores of the sea will get absorbed in the water. By 2050, 50% of jobs will also be lost because robots will be doing most of the work at that time. Let us tell you that 2050 will be a challenge to death.
Three and a half billion years ago, Earth's atmosphere contained almost no free oxygen. Instead, it consisted mainly of carbon dioxide, perhaps as much as 100 times more carbon dioxide than contained in today's atmosphere.
By 600 million years ago, the oxygen in the atmosphere reached about one-fifth of today's level (21 percent). The oxygen boom favored the evolution of lifeforms that could use oxygen to create energy. For other organisms, oxygen was poisonous, and they were forced into extreme airless habitats or into extinction.