The column of Marcus Aurelius in Piazza Colonna, Rome. This column featuring a spiral relief was built in honor of the Emperor’s victories in 180 AD.
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What is an emission nebula?

There are separate regions of higher density in the interstellar medium. These are clusters of gas, plasma, and space dust - interstellar clouds.

If hydrogen in such a region is ionized, i.e. represented as plasma, it is called an H II region. These regions are a type of emission nebula.

The emission nebulae that are H II regions are regions of active star formation. The closest to Earth that can be observed in the Northern Hemisphere is the Orion Nebula.
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The Hubble Telescope and the Triangle Galaxy
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Copenhagen
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A wind generator powered by air flows from passing cars
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Counties in the United States where more than 20% of the population lives below the poverty line
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This strength training exercise
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🇬🇧🎄 Christmas time at the National Gallery, Trafalgar Square, December 1948
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Heat and physics
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Terraced Rice Field, China
Photo by Thierry Bornier.
\#nature
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The last visitor of an abandoned Celtic castle
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Fuego volcano eruption
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Top 20 happiest and unhappiest countries in the world
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