| 現在約有 5000個人造衛星在天上飛 |
| 送交者: 明君小雪 2020月06月25日10:58:18 於 [五 味 齋] 發送悄悄話 |
| 回 答: 啊？？ 讓我好好想想。 由 明君小雪 於 2020-06-25 10:56:30 |
Number of launches to date (1957-2018)In the history of satellites, since the launch of first satellite Sputnik in 1957, around 8,378 satellites have been sent to space, as per the data by UNOOSA. These days there are 4994 satellites in orbit, out of which only 7 are revolving around planets other than earth. |
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