Today\u2019s Image of the Day from NASA Earth Observatory features a planet that is changing after dark.\u00a0<\/p>\n
New maps built from satellite data show where the world has been getting brighter at night.<\/p>\n
The maps also show where Earth has been dimming. The changes reveal shifts in economics, technology, energy use<\/a>, and urban growth.<\/p>\n The images come from NASA\u2019s Black Marble project, which tracks artificial light across Earth using satellites equipped to detect nighttime illumination.\u00a0<\/p>\n What is revealed about modern life<\/p>\n Instead of showing a simple rise in global brightness over time, the maps reveal something far more uneven.\u00a0<\/p>\n Some regions glow brighter year after year as cities expand and industries grow.\u00a0<\/p>\n Others fade as governments adopt energy-saving technology or face economic hardship and power shortages.<\/p>\n Artificial light has become one of the clearest visible signs of human activity on Earth.\u00a0<\/p>\n From highways and apartment towers to ports and factories, nighttime illumination can reveal where development is accelerating and where it is slowing down.\u00a0<\/p>\n It also exposes how deeply modern life depends on electricity.<\/p>\n What satellites see after dark\u00a0<\/p>\n NASA\u2019s Black Marble project<\/a> relies on observations from the VIIRS sensors aboard the Suomi-NPP, NOAA-20, and NOAA-21 satellites.\u00a0<\/p>\n These instruments measure nighttime light in wavelengths ranging from green to near-infrared.<\/p>\n The system can detect city lights, reflected moonlight, auroras, and other faint nighttime signals.\u00a0<\/p>\n Scientists then apply filtering methods to isolate artificial lighting patterns from natural sources of light.<\/p>\n Changes in nighttime brightness<\/p>\n The new analysis examined changes in nighttime brightness between 2014 and 2022 across most of the inhabited world, from 60 degrees south to 70 degrees north latitude.\u00a0<\/p>\n On the resulting maps, yellow and gold regions indicate places where lighting increased, while purple areas show dimming.<\/p>\n The study was published in April 2026 in the journal Nature, and one of the visualizations appeared on the magazine\u2019s cover.\u00a0<\/p>\n Researchers found that global radiance increased by 34 percent during the study period. That number alone sounds straightforward, but the details tell a much more complicated story.<\/p>\n Cities brighten while others fade<\/p>\n The maps show that brightening and dimming often happen side by side.\u00a0<\/p>\n In the United States, many West Coast cities became brighter as populations grew and urban development expanded.\u00a0<\/p>\n At the same time, large portions of the East Coast became dimmer.<\/p>\n Researchers linked much of that dimming to the spread of energy-efficient LED lighting and broader economic changes.\u00a0<\/p>\n LEDs<\/a> use far less electricity than older lighting systems and have rapidly replaced traditional streetlights in many cities over the past decade.<\/p>\n Light measurements from space<\/p>\n This shift has changed the appearance of cities from space. Older sodium vapor lights produced a warmer orange glow, while LEDs tend to create a whiter, sharper light.\u00a0<\/p>\n Because satellites<\/a> measure light differently depending on wavelength, some transitions to LEDs can actually appear dimmer in satellite observations even when streets remain fully lit.<\/p>\n That distinction matters because scientists increasingly use nighttime light data as a way to estimate economic activity, population growth, and infrastructure expansion.\u00a0<\/p>\n Changes in lighting technology can complicate those measurements.<\/p>\n Rapid development and industrial growth<\/p>\n Some of the most dramatic increases in nighttime brightness appeared in China and northern India.\u00a0<\/p>\n Rapid urban development, industrial growth, and expanding transportation networks contributed to large surges in artificial lighting across both countries.<\/p>\n Over the last two decades, many cities in those regions have expanded at extraordinary speed. New housing developments, highways, airports, and industrial zones have transformed once-dark landscapes into densely illuminated urban corridors visible from orbit.<\/p>\n Nighttime light data has become a valuable tool for tracking those changes because it offers a near real-time picture of development.\u00a0<\/p>\n In some parts of the world where official economic statistics may lag behind events on the ground, satellite observations can provide clues about growth patterns and infrastructure activity.<\/p>\n Consequences of artifical light<\/p>\n The spread of artificial light<\/a> also carries environmental consequences. Brighter nights affect wildlife migration, insect behavior, sleep cycles, and human health.\u00a0<\/p>\n Researchers have linked excessive nighttime illumination to disruptions in circadian rhythms and declining populations of some nocturnal species.<\/p>\n While parts of Asia grew brighter, several European countries showed substantial declines in nighttime illumination.\u00a0<\/p>\n France dimmed by 33 percent during the study period, while the United Kingdom dimmed by 22 percent and the Netherlands by 21 percent.<\/p>\n Researchers connected those declines to energy conservation efforts and the wider adoption of LEDs.\u00a0<\/p>\n A crisis visible from space<\/p>\n But the maps also captured a sudden and more dramatic shift in 2022, when Europe faced a major energy crisis following the outbreak of the Russia-Ukraine conflict.<\/p>\n As energy prices surged and governments urged conservation, cities and businesses reduced lighting to save electricity<\/a>.\u00a0<\/p>\n Public monuments went dark earlier, storefronts cut back illumination, and municipalities lowered street lighting levels in some areas.<\/p>\n The result became visible from space almost immediately.<\/p>\n The new NASA maps show that artificial light is more than a sign of modern civilization. It acts as a record of human decisions, economic pressure, technological change, and political events.\u00a0<\/p>\n Every brightening skyline and every dimming city leaves a trace visible far above Earth\u2019s surface.<\/p>\n Image Credit: NASA Earth Observatory\u00a0<\/p>\n \u2014\u2013<\/p>\n Like what you read? 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