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Because there is not supposed to be anyone out there.
Earth at night
" This new image of the Earth at night is a composite assembled from data acquired by the Suomi National Polar-orbiting Partnership (Suomi NPP) satellite over nine days in April 2012 and thirteen days in October 2012.
It took 312 orbits and 2.5 terabytes of data to get a clear shot of every parcel of Earth’s land surface and islands."
To put things into perspective, you can see the major cities of Australia spread out over the coastline, where most of the population lives.
Five major cities Perth (about 1,000,000 people),
Adelaide (about 1,000,000 people),
Melbourne (I don't know...maybe 3 million people?),
Sydney (I don't know again...maybe 4 million people around that area?),
Brisbane (2 million in the area, maybe?).
And then you have the desert area lit up like a Christmas tree with a population of zip, plus a few miners and military personnel.
So what's with all that light, which appears to put all the capital cities light combined to shame?