[分享] 从火星上看地球——一个暗淡的小蓝点

Views of the Pale Blue Dot
By Alan M. MacRobertMay 23, 2003 | There aren't any amateur astronomers on Mars (yet), but yesterday NASA released an image of what will await Mars colonists someday when they look to Earth with small telescopes.
The Mars Global Surveyor craft orbiting the red planet took a break from its work on May 8th to aim its high-resolution MOC camera at the "evening star" shining brightly in the Martian sky. Earth was only 19 arcseconds in diameter at the time and shining at magnitude –2.5, somewhat less brilliant than Venus appears in in our own sky. The Moon next to it was magnitude +0.9. At the time the Moon and Earth were nearly in line with each other (the Moon is in the background). Normally they appear much farther apart than seen here. The full image also captures Jupiter in the background, much farther to one side.

The surface of the Moon is so dark compared to Earth that the Moon's brightness had to be boosted in order for it to show well in the image. The MOC camera takes only black-and-white pictures; this view has been colorized based on other spacecraft pictures.

Several other space probes have taken Earth-Moon portraits (in real color) when the two were near the same line of sight. On December 16, 1992, the Galileo craft looked back at the pair just 8 days after swinging past Earth on its way to Jupiter. In the famous view at right, Antarctica is visible through clouds at the bottom of Earth's disk. The image was taken in violet, red, and near-infrared light, and these colors were adjusted to give a realistic look to the Earth. The colors were then enhanced to emphasize contrasts (the Moon is not actually brown). Again, the Moon has been artificially brightened.


For the image at left, Voyager 1 looked back to the Earth-Moon system on September 18, 1977, 13 days after its launch toward Jupiter. In the picture are eastern Asia, the western Pacific, and part of the Arctic. Voyager 1 was directly above Mount Everest on Earth's night side. Again, the Moon has been artificially brightened.


文字与图片均来自http://skyandtelescope.com/news/article_959_1.asp

！！
“伽利略”拍的。

！！
旅行者一号拍的。

火星上现在还没有天文爱好者。不过，昨天NASA发布了一张照片。这张照片上的景象，正是我们未来开赴火星的移民们从小望远镜中将看到的景象。
   环绕这颗红色星球运行的火星全球勘探者号飞船在5月8号“休息”时，用它的高分辨率MOC照相机对准了火星天空里的一颗明亮的“昏星”。地球那时的角直径只有19角秒，亮度为-2.5等。仅比我们看到的金星稍微暗一些。在地球旁边的月球上是+0.9等。那时，月球与地球几乎处在同一条直线上（月球处于地球的背景里）。通常，月球和地球之间的间隔要比照片上显示的大。完整的图（本贴附图）还拍到了木星。木星在背景的另一侧更远处。
   照片上的月球表面远比地球上见到的来得昏暗。以致于不得不增加亮度以更好的在图片上把它显示出来。MOC照相机拍出来的是黑白照片。图象根据其他探测器的照片做了上色处理。
   其他一些探测器在地球与月球靠近时也拍过它们的合照。（真彩色的照片） 1992年12月16日伽利略探测器在在去往木星途中，掠过地球8天后，回头拍了两者的合照。在右边的著名照片（照片2）里可以看到在地球视圆面底部，云层下面的南极洲。照片在紫、红、近红外波段拍摄，经过颜色处理，成为地球的真实的模样。色彩经过了加强，以增强对比。（月球实际上并不是褐色的。）另外，月球也被人工增亮了。
   左图（照片3）是旅行者1号在1977年9月18号，在它发射后向木星进发途中回头看到的地月系。照片上显示了东亚，西太平洋，和北极的一部分。旅行者1号当时正好处在珠穆朗玛峰的正上方。另外照片上的月球也经过的人工增亮。

附图！！！补上面的帖子的图片。

地球的魅力只有走出他之后才能感到！

是实拍的吗？怎么假的似的，还是因为太漂亮了，一会蓝一会紫的！

实拍？不会吧？？？？

朱文杰，那文章是你翻译的？

地球也不过如此！

我们生活的地球也不过如此渺小！

最初由 urania 发表
[B]朱文杰，那文章是你翻译的？

是不是不好？我是边自己看边翻译的，由于时间比较紧，所以就有点粗糙。以后改进！