Theories on the Origin of Life

Origins Of Life

The origin of life on Earth is a scientific problem which is not yet solved. There are plenty of ideas, but few clear facts. It is generally agreed that all life today evolved by common descent from a single primitive lifeform. It is not known how this early form came about, but scientists think it was a natural process which took place perhaps 3,900 million years ago. This is in accord with the philosophy of naturalism: only natural causes are admitted.

It is not known whether metabolism or genetics came first. The main hypothesis which supports genetics first is the RNA world hypothesis, and the one which supports metabolism first is the protein world hypothesis. Another big problem is how cells develop. All existing forms of life are built out of cells

The origin of life is one of the great mysteries in the Universe. To determine the origin of life, scientists are investigating the problem in several different ways. Some scientists are studying life on our own planet. Some scientists are seeking out life or fossil life on other planets or moons in our solar system.

Star System

And other scientists are trying to detect life in other solar systems, either by measuring life's effects on the atmospheres of distant planets or by measuring artificial radiation like radio signals that may be produced by advanced life


Thus far, the most fruitful approach has been to examine life on our own planet. However, even in our own backyard, it is difficult to determine life's origins because it began at least 3.5 billion years ago. We know that life began at least 3.5 billion years ago, because that is the age of the oldest rocks with fossil evidence of life on earth.


Rocks are rare because subsequent geologic processes have reshaped the surface of our planet, often destroying older rocks while making new ones. Nonetheless, 3.5 billion year old rocks with fossils can be found in Africa and Australia. They are usually a mix of solidified volcanic lavas and sedimentary cherts. The fossils occur in sedimentary cherts.


7 Theories on the Origin of Life

It started with an electric spark Lightning may have provided the spark needed for life to begin. Electric sparks can generate amino acids and sugars from an atmosphere loaded with water, methane, ammonia and hydrogen, as was shown in the famous Miller-Urey experiment reported in 1953, suggesting that lightning might have helped create the key building blocks of life on Earth in its early days.
Over millions of years, larger and more complex molecules could form Although research since then has revealed the early atmosphere of Earth was actually hydrogen-poor, scientists have suggested that volcanic clouds in the early atmosphere might have held methane, ammonia and hydrogen and been filled with lightning as well.
Molecules of life met on clay
The first molecules of life might have met on clay, according to an idea elaborated by organic chemist Alexander Graham Cairns-Smith at the University of Glasgow in Scotland. These surfaces might not only have concentrated these organic compounds together, but also helped organize them into patterns much like our genes do now.
The main role of DNA is to store information on how other molecules should be arranged. Genetic sequences in DNA are essentially instructions on how amino acids should be arranged in proteins. Cairns-Smith suggests that mineral crystals in clay could have arranged organic molecules into organized patterns. After a while, organic molecules took over this job and organized themselves.

The Moon

How the Moon Works

From anyplace on Earth, the clearest thing in the night sky is usually the moon, Earth's only natural satellite and the nearest celestial object (240,250 miles or 384,400 km away). Ancient cultures revered the moon. It represented gods and goddesses in various mythologies -- the ancient Greeks called it "Artemis" and "Selene," while the Romans referred to it as "Luna."

Because the moon is so close to the Earth relative to other celestial objects, it's the only one to which humans have traveled and set foot upon. In the 1960s, the United States and Russia were involved in a massive "space race" to land men on the moon. Both countries sent unmanned probes to orbit the moon, photograph it and land on the surface. In July 1969, American astronauts Neil Armstrong and Edwin "Buzz" Aldrin became the first humans to walk on the moon. .

During six lunar landing missions from 1969 to 1972, a total of 12 American astronauts explored the lunar surface. They made observati­ons, took ­photographs, set up scientific instruments and brought back 842 pounds (382 kilograms) of moon rocks and dust samples. What did we learn about the moon from these historic journeys?.

Our Earth

Constantly reminds you of love that round softness blue colour of ocean, Picture the world she is older now much older than she ever thought she will get, She looks at herself as she spins Arms loaded with the trophies of her most successful child The pylons and mines The powerplants shimmer in her still, cool breath Now, is that a smile that plays across her lips Or is it a tremor of dread? The sadness of mothers as they watch the fates of their children unfold
Kate Tempest UK Poet & Rapper



Could aliens have found humans first without us realizing? Scientists claim intelligent beings could be quietly watching humankind in a 'galactic ZOO' to protect us from the distressing truth of their existence

We may not yet have found evidence of alien life, but that doesn’t mean it hasn't found us


This is according to a group of scientists who gathered this week in Paris to discuss why, despite decades of searching and the high probability that life exists beyond our own atmosphere, we’ve yet to make contact.

One possibility, albeit unflattering, could be that intelligent aliens are intentionally shielding us from the truth because humans would struggle to cope with the reality of their existence, some say.


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The World Ends Here