Humanity how long

Ages : following the big bang Units : metre m ; kilometre km ; hectare ha ; kilogramme kg ; kilowatt-hour kWh. For example : 0. Masses : 1, g in 1 kg; 1, kg in 1 tonne. For example : tonne mass of a blue whale; million tonnes of global human biomass. Power and energy : 1 watt of power uses 1 joule of energy per second; about watts in 1 horsepower; 3, kilojoules kJ or kilocalories kcal in 1 kWh of energy, sustaining 1, watts for 1 hour. For example , a watt incandescent light bulb illuminates a room; 80 watts sustain human basal metabolic rate, using 6, kJ or 1, kcal or 1.

Patrick Doncaster , 7 November , one of the then 7,,, rising by per minute, 79 million per year. Between 1 and 2. This is what is known as the Out-of-Africa theory, which states all humans evolved from the same ancestors. As archaeologists continue to discover new evidence, the understanding of the evolution process of humans becomes complex. New evidence has led scientists to suggest that the Homo species might have developed independently within and outside Africa, since Homo erectus, a precursor to Homo sapiens, is known to have left Africa and migrated to other continents.

Homo habilis was the first of the modern humans. Homo habilis had a slightly larger skull signifying a bigger brain, smaller teeth and a smaller face than the Australopithecus. Homo erectus is the earliest human species to possess the body proportions of the modern human.

The species existed between 1. Four species are believed to have developed from Homo erectus: Homo floresiensis, Homo heidelbergensis, Homo neanderthalensis, and Homo sapiens. Homo sapiens began walking the African continent around , years ago and is the only species of the Homo genus that is not extinct.

Homo sapiens is the most advanced of all living species on the planet. From there, colonies have been found in Asia dating as far back as 14, years ago. The first human mission to space took place April 12, when Soviet cosmonaut Yuri Gagarin made a single orbit of Earth in his spacecraft, Vostok 1. Since then, our colonization efforts in space have focused mostly on space stations. The men died during re-entry June 29 due to spacecraft decompression, meaning no further flights went to that station.

There have been other space stations since. A notable example is Mir, which hosted several long-duration missions of a year or more — including the longest single spaceflight duration of any human to date, days, by Valeri Polyakov in The International Space Station launched its first piece Nov.

The first humans to start the continuous occupation included Expedition 1 members Bill Shepard U. Then it has doubled again, in 50 years to the present 7 billion. Quadrupling in a little over years. Just doubling of human population had taken one thousand year periods up until the 20th Century.