The Orion region is loaded with exceptionally high mass densities when
compared with open interstellar space.
Thus the mass concentration mechanisms inherent in a star's gravitational
collapse might not be needed for spontaneous planet formation in
interstellar space of that region.
It would be nice to suppose otherwise though...
From: Damien Broderick <firstname.lastname@example.org>
To: email@example.com <firstname.lastname@example.org>
Date: Monday, October 09, 2000 9:47 PM
>An amusing conceit:
>>Scientists have discovered 18 planet-like objects, drifting free of
>> any central star, in a region of the Orion constellation. If
>> young, cool bodies are in fact planets, these free floaters
>> pose a considerable challenge to current theories about how
>> planets form.
>>The team determined the objects' mass by plugging their data into
>> models of planet and brown dwarf formation. Researchers
>> generally classify bodies less than 13 times the mass of
>> (13 Jupiter masses) as planets, and bodies between 13 and 75
>> Jupiter masses as brown dwarfs.
>> The model results vary a bit depending on the objects' age,
>> mostly well within the range for planets. Sigma Orionis is
>> probably 5 million years old, so if the objects are equally
>> they are probably 8-15 Jupiter masses. If they are only 1 My,
>> fainter ones could be as small as 5 Jupiter masses.
>Uh, Robert, I don't suppose...
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