Featured Research

from universities, journals, and other organizations

Monkey Wrench In Solar System Evolution

Date:
August 19, 2005
Source:
University Of Toronto
Summary:
A University of Toronto scientist has found unexpectedly ‘young’ material in meteorites – a discovery that breaks open current theory on the earliest events of the solar system.

A University of Toronto scientist has found unexpectedly ‘young’ material inmeteorites – a discovery that breaks open current theory on theearliest events of the solar system.

A paper published today inthe August issue of Nature reports that the youngest known chondrules –the small grains of mineral that make up certain meteorites – have beenidentified in the meteorites known as Gujba and Hammadah al Hamra.

Researcherswho have studied chondrules generally agree that most were formed as asudden, repetitive heat, likely from a shock wave, condensed the nebulaof dust floating around the early Sun. Thinking that an analysis of thechondrules in Gujba and Hammadah al Hamra would be appropriate foraccurately dating this process, U of T geologist Yuri Amelin, togetherwith lead author Alexander Krot of the University of Hawaii, studiedthe chondrules’ mineralogical structure and determined their isotopicage. “It soon became clear that these particular chondrules were not ofa nebular origin,” says Amelin. “And the ages were quite different fromwhat was expected. It was exciting.”

Amelin explains that notonly were these chondrules not formed by a shock wave, but ratheremerged much later than other chondrules. “They actually post-date theoldest asteroids,” he says. “We think these chondrules were formed by agiant plume of vapour produced when two planetary embryos, somewherebetween moon-size and Mars-size, collided.”

What does this meanin the grand scheme of things? The evolution of the solar system hastraditionally been seen as a linear process, through which gases aroundthe early sun gradually cooled to form small particles that eventuallyclumped into asteroids and planets. Now there is evidence of chondrulesforming at two very distinct times, and evidence that embryo planetsalready existed when chondrules were still forming. “It moves ourunderstanding from order to disorder,” Amelin admits. “But I’m surethat as new data is collected, a new order will emerge.”

Financial support for this project was provided by NASA and the Canadian Space Agency.


Story Source:

The above story is based on materials provided by University Of Toronto. Note: Materials may be edited for content and length.


Cite This Page:

University Of Toronto. "Monkey Wrench In Solar System Evolution." ScienceDaily. ScienceDaily, 19 August 2005. <www.sciencedaily.com/releases/2005/08/050819085315.htm>.
University Of Toronto. (2005, August 19). Monkey Wrench In Solar System Evolution. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2005/08/050819085315.htm
University Of Toronto. "Monkey Wrench In Solar System Evolution." ScienceDaily. www.sciencedaily.com/releases/2005/08/050819085315.htm (accessed October 23, 2014).

Share This



More Space & Time News

Thursday, October 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Russian Cosmonauts Kick Off Final Spacewalk of 2014

Russian Cosmonauts Kick Off Final Spacewalk of 2014

Reuters - US Online Video (Oct. 22, 2014) — Russian cosmonauts Maxim Suraev and Alexander Samokutyaev step outside the International Space Station to perform work on the exterior of the station's Russian module. Rough Cut (no reporter narration) Video provided by Reuters
Powered by NewsLook.com
Comet Siding Spring Grazes Mars' Atmosphere

Comet Siding Spring Grazes Mars' Atmosphere

Newsy (Oct. 19, 2014) — A comet from the farthest reaches of the solar system passed extremely close to Mars this weekend, giving astronomers a rare opportunity to study it. Video provided by Newsy
Powered by NewsLook.com
Latin America Launches Communications Satellite

Latin America Launches Communications Satellite

AFP (Oct. 17, 2014) — Argentina launches a home-built satellite, a first for Latin America. It will ride a French-made Ariane 5 rocket into orbit, and will provide cell phone, digital TV, Internet and data services to the lower half of South America. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
This Week @ NASA, October 17, 2014

This Week @ NASA, October 17, 2014

NASA (Oct. 17, 2014) — Power spacewalk, MAVEN’s “First Light”, Hubble finds extremely distant galaxy and more... Video provided by NASA
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins