牧夫座空洞告诉你宇宙有多空旷，在直径2.5亿光年内星系数量只有60个左右，这个巨大的宇宙区域距离地球大约7亿光年。
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| VIDEOS | |||
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
| MP4 | N/A | 360P | Download |
| MP4 | N/A | 360P | Download |
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| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
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牧夫座空洞告诉你宇宙有多空旷，在直径2.5亿光年内星系数量只有60个左右，这个巨大的宇宙区域距离地球大约7亿光年。
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