Do we need a rapid dispersal mechanism for protoplanetary discs?

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webm
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File size: 359.24 MB
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flv
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Duration: 1 hour 4 mins 21 secs
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ipod
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Average bitrate: 505.31 kbits/sec
mov
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File size: 400.01 MB
Width: 384, Height: 288
Duration: 1 hour 4 mins 21 secs
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mp3
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Duration: 1 hour 4 mins 7 secs
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wmv
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