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Funny portrait of young stylish man against grey background Funny portrait of young stylish man against grey background Funny portrait of young stylish man with clown nose eating lollipop against grey background Beautiful daisies facing the sun. A bee wanders among the daisies, aged look version. Healthy jar of honey with bakery products on wooden background. Beautiful woman eye looking through a hole Brain x-rays of an adult person. Brain x-rays of an adult person. Pouring a glass of fresh milk against a white background. Happy Child Playing with Water in the Garden. Happy Child Playing with Water in the Garden. Happy Child Playing with Water in the Garden. Happy Child Playing with Water in the Garden. Italian tomato sauce background. Italian tomato sauce background. Person pours a glass of fresh milk against a white background. While the milk is poured, beverage background. Farmer holding in hands a chick on grey background. Happy Child Playing with Water in the Garden. Hand of an astronaut holding the globe on his finger on blue sky background.
NASA Public Image Edited. This image of United States city lights was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). Originally designed to view clouds by moonlight, the OLS is also used to map the locations of permanent lights on the Earth's surface.

The brightest areas of the Earth are the most urbanized, but not necessarily the most populated. 
Cities tend to grow along coastlines and transportation networks. 
Even without the underlying map, the outlines of many continents would still be visible. 

The United States interstate highway system appears as a lattice connecting the brighter dots of city centers.
Even more than 100 years after the invention of the electric light, some regions remain thinly populated and unlit.

The Earth Observatory describe how N.A.S.A. scientists use city light data to map urbanization.

N.A.S.A. Public Image Edited. This image of Europe city lights was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). Originally designed to view clouds by moonlight, the OLS is also used to map the locations of permanent lights on the Earth's surface.

The brightest areas of the Earth are the most urbanized, but not necessarily the most populated. (Compare western Europe with China and India.) 
Cities tend to grow along coastlines and transportation networks. 
Even without the underlying map, the outlines of many continents would still be visible. 
In Russia, the Trans-Siberian railroad is a thin line stretching from Moscow through the center of Asia to Vladivostok. 

Even more than 100 years after the invention of the electric light, some regions remain thinly populated and unlit. 

The Earth Observatory describe how N.A.S.A. scientists use city light data to map urbanization.

N.A.S.A. Public Image Edited. Astronauta cammina sul suolo lunare, sullo sfondo un pianeta Doctor holding white and pink pills against anxiety on light gray background Doctor holding white and pink pills against anxiety on light gray background Radiography front and back of the head Doctor in clinic sitting at desk looking at x-rays on tablet, white background with x-rays. Doctor with scrubs and stethoscope writing a prescription, on the white background with x-rays. Doctor's stethoscope isolated on white background. Doctor scrubs with stethoscope, thermometer and pens in the pocket. Doctor scrubs with stethoscope, thermometer and pens in the pocket. Robe Criminal Lawyer Robe Criminal Lawyer Robe Criminal Lawyer with law book. Robe Criminal Lawyer Saint Bernard dog relaxes lying in a park. Sunlight filtering through the majestic trees in the woods, Mountain of flowers, Italy Sunrise over the Adriatic Sea, Italy.
The rising sun touches the rocks and creates a nice reflection on the water. An abandoned house in the woods, in the background of the Sibillini Mountains, Italy. Sunrise over the Adriatic Sea, Italy.
The rising sun touches the rocks and creates a nice reflection on the water. An abandoned house in the woods, in the background of the Sibillini Mountains, Italy. Sunrise over the Adriatic Sea, Italy.
The rising sun touches the rocks and creates a nice reflection on the water. Sunrise over the Adriatic Sea, Italy.
The rising sun touches the rocks and creates a nice reflection on the water. Sunrise over the Adriatic Sea, Italy.
The rising sun touches the rocks and creates a nice reflection on the water. Madonna of Lambro mountain with cross on top shrouded by clouds in the background, in the foreground the autumn vegetation watered by the rays of the sun. Piece of shaped earth puzzle that is separated in space and arrives
N.A.S.A. Public Image edited. Piece of puzzle shaped earth that is separated and arrives in space.

N.A.S.A. Public Image edited. Madonna of Lambro mountain with cross on top shrouded by clouds in the background, in the foreground the autumn vegetation watered by the rays of the sun. This image of Earth's city lights was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). Originally designed to view clouds by moonlight, the OLS is also used to map the locations of permanent lights on the Earth's surface.

The brightest areas of the Earth are the most urbanized, but not necessarily the most populated. (Compare western Europe with China and India.) Cities tend to grow along coastlines and transportation networks. Even without the underlying map, the outlines of many continents would still be visible. The United States interstate highway system appears as a lattice connecting the brighter dots of city centers. In Russia, the Trans-Siberian railroad is a thin line stretching from Moscow through the center of Asia to Vladivostok. The Nile River, from the Aswan Dam to the Mediterranean Sea, is another bright thread through an otherwise dark region.

Even more than 100 years after the invention of the electric light, some regions remain thinly populated and unlit. Antarctica is entirely dark. The interior jungles of Africa and South America are mostly dark, but lights are beginning to appear there. Deserts in Africa, Arabia, Australia, Mongolia, and the United States are poorly lit as well (except along the coast), along with the boreal forests of Canada and Russia, and the great mountains of the Himalaya.

The Earth Observatory article Bright Lights, Big City describes how NASA scientists use city light data to map urbanization.