HOME >> BIOLOGY >> NEWS
The Milky Way shaped life on Earth

Frenzied star-making in the Milky Way Galaxy starting about 2400 million years ago had extraordinary effects on life on Earth. Harvests of bacteria in the sea soared and crashed in a succession of booms and busts, with an instability not seen before or since. According to new results published by Dr. Henrik Svensmark of the Danish National Space Center in the journal Astronomische Nachrichten, the variability in the productivity of life is closely linked to the cosmic rays, the atomic bullets that rain down on the Earth from exploded stars. They were most intense during a baby boom of stars, many of which blew up.

'The odds are 10,000 to 1 against this unexpected link between cosmic rays and the variable state of the biosphere being just a coincidence, and it offers a new perspective on the connection between the evolution of the Milky Way and the entire history of life over the last 4 billion years,' Dr Svensmark comments.

Dr Svensmark looked at the long record of life's bounty given by counts of heavy carbon atoms, carbon-13, in sedimentary rocks. When bacteria and algae in the ocean grow by taking in carbon dioxide, they prefer the ordinary carbon-12 atoms. As a result, the sea becomes enriched in carbon-13, which is acceptable to sea creatures building their carbonate shells. Variations in carbon-13 therefore record how much photosynthetic growth was in progress when the shell-makers were alive in other words, how productive the biosphere was at that time.

To his surprise, Dr Svensmark noticed that the biggest fluctuations in productivity coincided with high star formation rates and cool periods in Earth's climate. Conversely, during a billion years when star formation was slow, cosmic rays were less intense and Earth's climate was warmer, the biosphere was almost unchanging in its productivity.

This reveals a link more subtle than any straightforward idea of, say, a warm climate being life-friendly or a cold climate
'"/>

Contact: Dr Henrik Svensmark
hsv@spacecenter.dk
452-063-4740
Danish National Space Center
14-Nov-2006


Page: 1 2

Related biology news :

1. Facial attraction -- choice of sexual partner shaped the human face
2. Why is the heart heart-shaped?
3. Whats shaped like a pear and has two genomes? Check the pond
4. Three at MIT conceive cell-shaped building
5. Evidence human activities have shaped large-scale ecological patterns
6. A sea otter-shaped rubble pile in space
7. First high-flex knee replacement implant shaped specifically to fit womans anatomy
8. Why are letters and other human visual signs shaped the way that they are?
9. MicroRNAs have shaped the evolution of the majority of mammalian genes
10. For two primates, patience takes different forms, shaped by ecology
11. Evolution of taste receptor may have shaped human sensitivity to toxic compounds

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/29/2016)... 29, 2016 LegacyXChange, Inc. (OTC: ... and SelectaDNA/CSI Protect are pleased to announce our successful ... a variety of writing instruments, ensuring athletes signatures against ... collectibles from athletes on LegacyXChange will be assured of ... DNA. Bill Bollander , CEO states, ...
(Date:3/22/2016)... , March 22, 2016 ... research report "Electronic Sensors Market for Consumer Industry by ... & Others), Application (Communication & IT, Entertainment, ... - Global Forecast to 2022", published by ... is expected to reach USD 26.76 Billion ...
(Date:3/21/2016)... -- Unique technology combines v ...   Xura, Inc. (NASDAQ: ... communications services, today announced it is working alongside SpeechPro ... particularly those in the Financial Services Sector, the ability ... a mobile app, alongside, and in combination with, traditional ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... 23, 2016  The Prostate Cancer Foundation (PCF) is pleased to ... faster cures for prostate cancer. Members of the Class of 2016 were selected ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample ... the Arkansas State Crime Laboratory, has joined STACS DNA as a Field Application Specialist. ... said Jocelyn Tremblay, President and COO of STACS DNA. “In further expanding our capacity ...
(Date:6/23/2016)... Andrew D Zelenetz ... Published recently in Oncology ... touchONCOLOGY, Andrew D Zelenetz , discusses the ... is placing an increasing burden on healthcare systems ... With the patents on many biologics expiring, interest ...
(Date:6/23/2016)... ... 23, 2016 , ... Velocity Products, a division of Morris ... optimized exclusively for Okuma CNC machining centers at The International Manufacturing Technology Show, ... several companies with expertise in toolholding, cutting tools, machining dynamics and distribution, Velocity ...
Breaking Biology Technology:
Cached News: