Asteroid resembling materials discovered in comet dustJanuary 25th, 2008 - 12:31 pm ICT by admin
Washington, Jan 25 (ANI): New research by scientists at Lawrence Livermore National Laboratory (LLNL) has revealed that the dust from the comet Wild 2 resembles asteroid materials rather than an ancient, unaltered comet.
Wild 2 doesnt look like what we thought all comets should look like, said LLNLs Hope Ishii, lead author of the research.
This finding was made after latest analysis of the samples that Stardust mission returned to Earth in 2006, which also found out that in addition to containing material that formed very close to the young sun, the dust from Wild 2 is missing ingredients that would be expected in comet dust.
Though comets are expected to contain large amounts of the most primitive material in the solar system - a treasure trove of stardust from other stars and other ancient materials, in the case of Wild 2, that has not been found.
The material found in primitive objects just wasnt there in the samples, said John Bradley, a LLNL author.
By comparing the Stardust samples to cometary interplanetary dust particles (CP IDPs), the research team found that two silicate materials normally found in cometary IDPs, together with other primitive materials including presolar stardust grains from other stars, have not been found in the abundances that might be expected in a Kuiper Belt comet like Wild 2.
This is one of the first studies to closely compare Stardust particles to CP IDPs. This class of IDPs is believed to contain the most primitive and unaltered fraction of the primordial material from which our planets and other solar system objects formed.
According to the research, the high-speed capture of the Stardust particles may be partially responsible for the team not finding comet-like materials from Wild 2 samples.
But, extra refractory components that formed in the inner solar nebula within a few astronomical units of the sun, indicate that the Stardust material resembles chondritic meteorites from the asteroid belt.
The material is a lot less primitive and more altered than materials we have gathered through high altitude capture in our own stratosphere from a variety of comets, said Ishii.
As a whole, the samples look more asteroidal than cometary, he added. (ANI)
- Scientists find 'ultra-primitive' particles in comet dust - Nov 03, 2009
- Poisonous chemical formaldehyde linked to origin of life on Earth - Apr 05, 2011
- NASA craft prepares for Valentine's Day date with comet - Jan 20, 2011
- Scientists make first measurement of age of cometary material - Feb 26, 2010
- Scientists conduct 'post-mortem of comet' to find origins of solar system - May 29, 2010
- NASA's Swift satellite, Hubble Telescope probe asteroid collision debris - Apr 29, 2011
- Scientists find strong evidence for presence of liquid water in comet - Apr 06, 2011
- 'Asteroid' found 100 years ago could be an extinct comet - Dec 24, 2010
- Reason for zodiac glow in the eastern night sky identified - Apr 16, 2010
- Analysis of comet dust challenges theories of history and evolution of solar system - Sep 19, 2008
- Space dust changing weather conditions? - Apr 05, 2012
- Cosmic 'dandruff' could have brought carbon to Earth - May 07, 2010
- Potato-shaped asteroid could be a stillborn planet - Oct 30, 2011
- First images of aftermath of possible asteroid collision captured - Oct 14, 2010
- Earliest rocks in solar system 'looked more like candy floss' - Mar 28, 2011
Tags: ancient materials, astronomical units, chondritic meteorites, comet dust, comet wild 2, interplanetary dust particles, ishii, john bradley, kuiper belt, lawrence livermore national, lawrence livermore national laboratory, livermore national laboratory, llnl, primitive materials, primitive objects, primordial material, silicate materials, solar nebula, solar system objects, treasure trove