Main differences between SETI and Extended SETI (E-SETI)

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Main differences between SETI and Extended SETI (E-SETI)

By SETI, I do not mean the search for other civilizations or aliens, I'm talking about something very different.

"E-SETI"

The SETI Institute is funded by the National Aeronautics and Space Administration to support SETI research, and to provide tools, techniques, and resources to both scientists and the public to better understand SETI.

The SETI Institute supports "E-SETI" which is a form of a "SETI project" called "Extended SETI". What is this "E-SETI"? What does it mean?

E-SETI (Extended SETI)

We have SETI (search for extra-terrestrial intelligence) and E-SETI (the search for technology in the Universe to aid the SETI search), E-SETI is what SETI will one day become, a search for signs of extra-terrestrial intelligence, and the discovery of intelligent life forms.

E-SETI is the current phase of SETI and is where it has been heading for the last 3 decades, we are looking for SETI - we are not finding anything yet, but it has all been leading to E-SETI.

What can we learn by studying the Universe?

SETI has been one of the most successful sciences and disciplines in the history of mankind. SETI is the search for other forms of life, and the answer to some of the questions about the Universe and humanity.

We have recently learned that only 6.6 of the stars have planetary systems, and that many of these planets are very hostile and inhospitable. We have also discovered that many stars are much older than our sun (the sun has only been alive for around 4.5 billion years).

The Universe is so complex that it has created many wonders, life, energy, intelligence, but also waste and decay, life is like a pendulum, it goes up, and then it goes down, in a never ending cycle of life and death, the decay of life, and then the birth and evolution of new life.

How did intelligent life evolve on Earth?

From the start of life on Earth, 3.8 billion years ago, there was a small amount of oxygen in the atmosphere, very high levels of carbon and sulphur dioxide, a little ammonia, a little phosphorous and methane.

At that time all plants were algae, and bacteria. Life forms began to use up the oxygen and the carbon from the atmosphere, then the oxygen levels dropped and life forms began to breathe in hydrogen, and carbon from water.

At that time the atmosphere contained no ozone, no free oxygen, there were just carbon and water. Carbon was being fixed in photosynthesis, and oxygen was being used in respiration. It was this oxygen that made life on Earth possible.

However at this stage there was no nitrogen and no carbon, so no carbon was being fixed in the first photosynthesis.

About 2 billion years ago, about 2.5 billion years ago, there was an explosion in evolution, something incredible happened, the first forms of complex life took form, the first forms of carbon fixation took place, the first forms of respiration took place.

The oxygen then rose very high, and then the oxygen levels began to drop, life forms began to die out, and then the oxygen began to rise again.

It took an incredible amount of time for the life forms to evolve, billions of years, and it is estimated that it could take hundreds of thousands of years for them to evolve.

It took a long time, but there is evidence of this, when the atmosphere contained a lot of oxygen, when the seas had a lot of oxygen, the seas had a lot of carbon and bacteria.

When the seas began to die out, the oceans became low in oxygen, there was less carbon and less carbon fixation, more carbon was getting up into the atmosphere, and it was being fixed in photosynthesis, and then the oceans had a massive amount of free oxygen.

At this stage in time there was no more living organisms in the sea, there was no more living organisms in the atmosphere, there was no more living organisms in the water, the only living organism left was life in the land.

There were all these land animals, and there were these land plants, and there was also some bacteria in the land, but there were none of these in the ocean.

In other words, the atmosphere was in the state we are in now, but there were no land animals.

There was no land living organisms for a long time, perhaps billions of years.

At some stage, perhaps 100 million years ago, there was a massive increase in evolution, a mass extinction, where every form of life was wiped out on land, except for those that were on land.

The land ones evolved to become amphibians, and then reptiles.

Then we started to evolve to become like them.

But, when we took a step back and we had an overall view, we realised that there were actually more types of animals and plants on land than there were on the land.