Transcripts of 12807_Disk_Simulation_H264_1080

[00:00:00.01] ♪Music♪
[00:00:04.05] ♪Music♪[HD 141569A] [Disks of debris around stars often show striking patterns...]
[00:00:08.09] ♪Music♪[Like arcs]
[00:00:12.14] ♪Music♪[rings]
[00:00:16.17] ♪Music♪[and spirals.]
[00:00:20.20] ♪Music♪
[00:00:23.27] ♪Music♪[Do these features tell us unseen planets are stirring gas and dust in these disks?]
[00:00:27.35] ♪Music♪
[00:00:31.48] ♪Music♪[No, according to a new NASA simulation.]
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[00:00:38.78] ♪Music♪[Interactions between dust, gas and starlight let disks form these patterns on their own.]
[00:00:42.98] ♪Music♪
[00:00:47.10] ♪Music♪[Starlight strips electrons from dust.]
[00:00:51.22] ♪Music♪[These electrons heat up nearby gas.]
[00:00:55.27] ♪Music♪
[00:00:59.31] ♪Music♪
[00:01:02.45] ♪Music♪[The gas pressure rises, trapping more dust]
[00:01:05.60] ♪Music♪[which then heats more gas, trapping more dust..]
[00:01:08.79] ♪Music♪[and a cycle of growth begins.]
[00:01:14.04] ♪Music♪[The interplay of dust and gas results in patterns like those seen in real disks.]
[00:01:21.15] ♪Music♪[Ars, rings and spirals can form by themselves...]
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[00:01:26.28] ♪Music♪[no planets needed.]
[00:01:29.31] ♪Music♪
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[00:01:38.65] [Beeping]
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[00:01:44.84] [Beeping]