1989年8月22日：旅行者号（Voyager）2号揭示海王星（Neptune）

1977年发射的旅行者号2号在经过十二年的飞行后抵达了海王星。1989年8月22日，美国国家航天局（NASA）宣布该探测器拍摄的图像证实了海王星拥有光环系统。

On Aug. 20, 1977, Voyager 2 launched from Cape Canaveral and began its epic journey to the outer planets – and beyond. Twelve years later, the spacecraft photographed Neptune as it approached the ice giant. Two days after that, on Aug. 22, 1989, NASA announced that Neptune had a ring system; the images had revealed Continue reading "Aug. 22, 1989: Voyager 2 reveals Neptune" The post Aug. 22, 1989: Voyager 2 reveals Neptune appeared first on Astronomy Magazine .