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Gatot Joyowardoyo
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2015-11-18
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No more supernatural things...

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Before the birth of the Sun : Monash University researchers have been investigating the period before the appearance of the Sun. While this is a combination of archeology and geology and astronomy. It only highlights that astronomers peer into the past - sometimes far beyond what anyone else does,  to come up with viable hypothesis on how our Sun was born. Interesting story which is part of our history.

Prehistory of the solar system : "Using heavy radioactive nuclei found in meteorites to time these final additions, we have got a clearer understanding of the prehistory of the solar system," Lugaro said. "We can now tell with confidence the final one per cent of gold, silver and platinum, were added to the solar system matter roughly 100 million years before the birth of the sun. "The final one per cent of lead and rare-earth elements, such as those that make your smart phone, was added much later - at most, 30 million years before the birth of the sun."

Stellar nursery : Some time after the last addition of heavy elements the solar system matter went into an 'incubation' period, during which time the stellar nursery formed - where the sun was born together with a number of other stars. "We now know this incubation period could not have lasted more than 30 million years. This offers us the chance to determine the lifespan of the nursery where the sun was born, how massive it was and how many stars were born there together," Dr Lugaro said. "Ultimately, we want to have a clear understanding of the circumstances of the birth of our star and the prehistory of the solar system.

Stellar nucleosynthesis : The process by which the natural abundances of the chemical elements within stars vary due to nuclear fusion reactions in the cores and overlying mantles of stars. Stars are said to evolve (age) with changes in the abundances of the elements within. Core fusion increases the atomic weight of its gaseous elements, causing pressure loss and contraction accompanied by increase of temperature. Structural changes of the star (evolution) become necessary to stabilize it. Stars lose most of their mass when it is ejected late in their stellar lifetimes, thereby increasing the abundance of elements heavier than helium in the interstellar medium.

Article link: http://www.science20.com/news_articles/solar_system_prehistory_what_caused_the_birth_of_the_sun-142206

Wikipedia link : http://en.wikipedia.org/wiki/Stellar_nucleosynthesis

Sciencedaily article source: http://www.sciencedaily.com/releases/2014/08/140807145746.htm

Abstract of paper: http://www.sciencemag.org/content/345/6197/650

Reference material from Monash U : http://www.eurekalert.org/pub_releases/2014-08/mu-sct080414.php

Summary: http://www.sciencemag.org/content/345/6197/620.summary

Pic courtesy: http://astarmathsandphysics.com/a-level-physics-notes/cosmology/a-level-physics-notes-cosmology-the-birth-of-the-solar-system.html (for illustration only)

#scienceeveryday #sciencesunday  
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If CO2 was a visible gas do you think it would change the way we live? Would you reduce your carbon footprint if it looked like this?

#climatechange #greenhousegas #carbonfootprint  
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Beers of the #Soccer   #WorldCup  from all 32 countries.
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See TIME’s new cover on why “the argument against fat was totally and completely flawed.” http://ti.me/1pMuQZc
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Eloquency does not come with fluency, but authencity.. Hyeonseo Lee: My escape from North Korea: http://youtu.be/PdxPCeWw75k
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