| 1 | It looked like a huge disc. | |
| 2 | The edge of the disc had been machined flat/smooth. | |
| 3 | These disks are the remnants of planetary formation. | |
| 4 | No disks, no planets; and no planets, no life. | |
| 5 | Older stars reside in the bulge at the center of the galactic disk. |
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