This photo was taken via satellite, on a cloudless day.
Note how the lights are already on in Holland, Paris, and Barcelona,and how it is still daylight in London, Lisbon, and Madrid.
The sun is still shining on the Straight of Gibraltar, and the
Mediterranean Sea is already in darkness.
In the middle of the Atlantic Ocean you can see the Azores Islands;
belowthem to the right, the Madeira Islands; a bit below them the
Canary Islands; further south, close to the furthest western point of
Africa, the Cape Verde Islands.
Note how the Sahara looks daytime and nighttime.
To the left, on top, is Greenland. MET

 

Click to enlarge - it's big but well worth the look at our night-time presence viewed from space.

Crater rim on Mars from the on-going Mars Global Surveyor Mission - NASA (Jan 2003). Gravity at work causing rockfalls and talus cones. Note the gullies that head along a specific horizon (outcrop) towrd the upper rim. These suggest recent seepage of subsurface groundwater. Note the flow patetrns from water onto alluvial fans downslope and a couple of debris flows :-). On the crater floor are sand dunes made by the strong Martian winds. RCK

Groundwater sapping (seepage) along a crater rim on Mars. Note how the water emerges from a specific stratum, reflecting a zone of increased permeability. Water likely exists in the subsurface as permafrost, leftover from a warmer and wetter climate early in Mars history. Image from Mars Global Surveyor-NASA. RCK

Ground view from Mars Pathfinder Mission in 1997 acros the mouth of one of the large flood outflow channels of Mars - Ares Valles. The surface is strewn with a mix of boulders of various composition probably deposited by the floods. In the distance are the Twin Peaks, islands that were streamlined byt he flood flows. From NASA-Mars Pathfinder RCK