Chondrules younger than thought

Aug 19, 2005

A University of Toronto scientist has found unexpectedly "young" material in meteorites, a discovery that breaks open current theory the early solar system.

Researchers who have studied chondrules generally agree that most were formed as a sudden, repetitive heat, likely from a shock wave, condensed the nebula of dust floating around the early sun.

University of Toronto geologist Yuri Amelin and lead author Alexander Krot of the University of Hawaii studied the chondrules' mineralogical structure of the meteorites of Gujba and Hammadah al Hamra and determined their isotopic age. "It soon became clear that these particular chondrules were not of a nebular origin," says Amelin. "And the ages were quite different from what was expected. It was exciting."

Amelin said not only were these chondrules not formed by a shock wave, but they emerged much later than other chondrules.

The evolution of the solar system has been seen as a linear process, through which gases around the early sun gradually cooled to form small particles that eventually clumped into asteroids and planets. Now there is evidence of chondrules forming at two very distinct times, according to the study published in Nature.

Copyright 2005 by United Press International

Explore further: Study of equatorial ridge on Iapetus suggests exogenic origin

add to favorites email to friend print save as pdf

Related Stories

Dusty Shock Waves Generate Planet Ingredients

Nov 11, 2008

(PhysOrg.com) -- Shock waves around dusty, young stars might be creating the raw materials for planets, according to new observations from NASA's Spitzer Space Telescope.

Jupiter's formation linked to that of primitive meteorites

Mar 04, 2005

The process that formed the giant planet Jupiter may also have spawned some of the tiniest and oldest members of our solar system -- millimeter-sized spheres called chondrules, the major part of the most primitive meteo ...

Recommended for you

Another fireball explodes over Russia

2 hours ago

Why does Russia seem to get so many bright meteors? Well at 6.6 million square miles it's by far the largest country in the world plus, with dashboard-mounted cameras being so commonplace (partly to help ...

NASA's MMS observatories stacked for testing

3 hours ago

(Phys.org) —Engineers at NASA's Goddard Space Flight Center in Greenbelt, Md., accomplished another first. Using a large overhead crane, they mated two Magnetospheric Multiscale, or MMS, observatories – ...

ISEE-3 comes to visit Earth

4 hours ago

(Phys.org) —It launched in 1978. It was the first satellite to study the constant flow of solar wind streaming toward Earth from a stable orbit point between our planet and the sun known as the Lagrangian ...

Testing immune cells on the International Space Station

18 hours ago

The human body is fine-tuned to Earth's gravity. A team headed by Professor Oliver Ullrich from the University of Zurich's Institute of Anatomy is now conducting an experiment on the International Space Station ...

Easter morning delivery for space station

Apr 20, 2014

Space station astronauts got a special Easter treat: a cargo ship full of supplies. The shipment arrived Sunday morning via the SpaceX company's Dragon cargo capsule.

User comments : 0

More news stories

Another fireball explodes over Russia

Why does Russia seem to get so many bright meteors? Well at 6.6 million square miles it's by far the largest country in the world plus, with dashboard-mounted cameras being so commonplace (partly to help ...

ISEE-3 comes to visit Earth

(Phys.org) —It launched in 1978. It was the first satellite to study the constant flow of solar wind streaming toward Earth from a stable orbit point between our planet and the sun known as the Lagrangian ...

NASA's MMS observatories stacked for testing

(Phys.org) —Engineers at NASA's Goddard Space Flight Center in Greenbelt, Md., accomplished another first. Using a large overhead crane, they mated two Magnetospheric Multiscale, or MMS, observatories – ...

Easter morning delivery for space station

Space station astronauts got a special Easter treat: a cargo ship full of supplies. The shipment arrived Sunday morning via the SpaceX company's Dragon cargo capsule.

Teachers' scare tactics may lead to lower exam scores

As the school year winds down and final exams loom, teachers may want to avoid reminding students of the bad consequences of failing a test because doing so could lead to lower scores, according to new research published ...