gondolas anchored in foreground, cathedral of san giorgio maggiore in bkgd, across water / gondolas, other boats and cathedral in bkgd / tilt up lamp... - 瑪爾斯 個影片檔及 b 捲影像00:34
the solar family - part 15 of 18. makes an introductory study of the planets - their evolution, motions, sizes, and satellites. describes the evolution of the solar system according to planetesimal hypothesis, and traces the real and apparent motions of t - 瑪爾斯 個影片檔及 b 捲影像00:35太陽系, 外太空