The sweet spot was 4.33 billion years ago, although Earth may have become suitable for the RNA World as early as 4.4 billion years ago, given that extreme bombardment by asteroids, comets and other rocky leftovers of planet formation had largely stopped by then, the researchers reported in a study published Tuesday (Sept. 22) in the journal Nature Communications.
"The timing is consistent with previous estimates of approximately 4.35 billion years ago, but our range of uncertainty is significantly narrower," Abramov explained, adding that "previous ranges included 4.46 to 4.26 billion years ago, and 4.45 to 3.9 billion years ago."
RNA evolved into its more chemically stable cousin, DNA, sometime before the emergence of LUCA. Scientists think the RNA World first developed into an RNA-and-protein world, and that DNA then appeared in two distinct stages nicknamed the U-DNA and T-DNA worlds.
"We constructed an impact bombardment model constrained by observables such as the lunar cratering record," Abramov said. "We examined both detrimental effects of impacts, such as temperature-induced degradation of key biomolecules, and effects conducive to life, such as generation of hydrothermal systems."
However, the conditions stabilized after 4.4 billion years ago. And as a result, hydrothermal vent clusters appeared within the near-surface crust that concentrated the ingredients for RNA, including nucleotides, short amino-acid chains called peptides and fat-like compounds known as lipids, Abramov said.
RELATED STORIES"These criteria point to the Earth becoming suitable for an RNA World between 4.4 and 4.3 billion years ago, with optimal conditions at approximately 4.33 billion years ago," he said.
"The duration of the RNA World is highly uncertain, and our study did not explicitly constrain it," he said.
Hence then, the article about scientists identify sweet spot for early stage of life on earth that preceded luca the ancestor of all living things was published today ( ) and is available on Live Science ( Middle East ) The editorial team at PressBee has edited and verified it, and it may have been modified, fully republished, or quoted. You can read and follow the updates of this news or article from its original source.
Read More Details
Finally We wish PressBee provided you with enough information of ( Scientists identify 'sweet spot' for early stage of life on Earth that preceded LUCA, the ancestor of all living things )
Also on site :
- HDFC Bank Limited Sued for Securities Law Violations - Contact the DJS Law Group to Discuss Your Rights - HDB
- Quote of the Day: Cleanthes Worked Night Shifts as a Water Carrier to Study Philosophy by Day. Then He Took Over Ancient Greece’s Leading Stoic School
- Anne Hathaway Will Campaign This Awards Season in an Unexpected Category, 13 Years After Her Oscar Win