British scientists claim to have found alien organisms in Earth s atmosphere,suggesting that life is continually arriving to our planet from space and did not originate here. The Progressive ...

But real lightning would have struck infrequently—and mostly in open ocean, where organic compounds would have quickly ...

Nitrogen is one of the primary nutrients critical for the survival of all living organisms. Although nitrogen is very abundant in the atmosphere, it is largely inaccessible in this form to most ...

Nitrogen and phosphorus are also essential elements in living organisms ... gas makes up 78% of Earth’s atmosphere, but nitrogen forms readily useable by organisms are typically much scarcer ...

A groundbreaking new study has pushed the timeline of life’s origin further back than previously thought. Researchers have determined that the last universal common ancestor (LUCA) – the microbe from ...

The earliest living organisms were microscopic bacteria ... Some three billion years ago, the Earth's atmosphere was virtually devoid of oxygen. At about 2.4 billion years ago, oxygen was released ...

When cosmic rays reach Earth’s upper atmosphere, physical and chemical interactions form the radioactive isotope carbon-14. Living organisms absorb this carbon-14 into their tissue. Once they die, the ...

Both life and geological processes get their start in the Archaean era amidst a brew of atmospheric gases ... celled bacteria are the oldest-known living organisms. Most bacteria reproduce by ...

The nitrogen cycle is the process during which nitrogen moves through both living organisms and physical environments including the atmosphere, soil, water, plants, animals and bacteria. It is central ...