Oil slicks are notoriously difficult to spot in natural-color (photo-like) satellite imagery because a thin sheen of oil only slightly darkens the already dark blue background of the ocean.

浮油出名的难以被发现在天然色卫星图像上，因为稀薄光泽的石油仅仅略黑于深蓝色的大海。

youdao

Satellite image of drained areas (grey) amongst marshland (dark red) around the Tigris and Euphrates rivers in Iraq.

伊拉克境内底格里斯河与幼发拉底河附近的枯竭区(灰色)与沼泽地(暗红色)的卫星图像。

youdao

On Feb. 1, 2011, the Hinode satellite captured this breathtaking image of a coronal hole, the dark area seen at the right side of this image. A second, polar coronal hole can also be seen at left.

在2011年2月1日,日本名为日之出（Hinode)的卫星捕获了这张惊人的日冕洞图像,这个黑暗的区域在这个图片的右边，另外一个与之相对的日冕洞在图片的左边出现。

youdao

But on Friday (12 December), an international group of astronomers claimed analysis of data returned from the European Space Agency's (Esa) XMM-Newton satellite observatory casts doubt on the existence of dark energy.

BBC: NEWS | Science/Nature | Dark energy tops science class

While there's some comfort to be had in knowing that technologies like satellite internet access are available if the lines go dark once again, we just hope that peace comes to the country instead.

ENGADGET: Syrian internet access mostly restored, for now

The mobile telephone, satellite television and the internet all have the potential to weaken their capacity for keeping their people in the dark and under their control.

ECONOMIST: Tunisia and the Arab world