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Fraser
2005-Mar-03, 06:16 PM
SUMMARY: Scientists have long been puzzled how chondrules could have formed. These are tiny, millimetre-sized spheres that make up primitive meteorites, and were somehow baked 4.6 billion years ago. New calculations show that the as giant planets, like Jupiter, formed in the early Solar System, they created regions of higher pressure and radiation called "shocks". As tiny particles entered these shocks at more than 30,000 kph, they were melted together to form these tiny chondrule droplets.

View full article (http://www.universetoday.com/am/publish/giant_spawn_micro.html)

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antoniseb
2005-Mar-03, 08:36 PM
This is a great story. I never liked the idea that chondrules were created in some FLASH when fusion turned on in the sun. The layers of material making up the sun should have prevented such an event from being a hot furious moment. This gives a realistic explanation. It also gives some predictions as to where we should find chondrules, and where we should not.

iantresman
2005-Mar-03, 11:42 PM
Originally posted by antoniseb@Mar 3 2005, 08:36 PM
This calculation has probably removed the last obstacle to acceptance of how chondrules were melted, remarked theorist....
This is what I don't like about press releases, statement that imply that everything is now understood. This is only a theory!

Another theory was suggested just a few weeks ago: "Solar-system-scale lightning storms triggered by gamma-ray bursts may be responsible for a key feature of stony meteorites.", details here (http://www.astronomy.com/default.aspx?c=a&id=2853).

And yet another theory, "Plasma Generated Spherules" is being presented at the forthcoming APS April Meeting, details here (http://meetings.aps.org/Meeting/APR05/Event/29058).

Regards,
Ian Tresman

antoniseb
2005-Mar-03, 11:56 PM
Originally posted by iantresman@Mar 3 2005, 11:42 PM
This is what I don't like about press releases, statement that imply that everything is now understood.
I agree. Granted, this is the theory I like best, and the one that is most main stream, but this is yet another example of a need to make a strong statement overpowering accuracy in a press release.