Ask the ChatbotGames & QuizzesHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyVideos
Strömgren sphere
Directory
References
Discover
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Bar graph of the United States Death Toll during major events. Infogram chart.
U.S. Death Toll During Major Events
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution
The Rise of the Machines: Pros and Cons of the Industrial Revolution
Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium
When Was the Periodic Table Invented?
World Data Locator Map: Australia
Is Australia an Island?
airplane in flight (plane, aircraft, flying)
7 Puzzling Plane Disappearances

Strömgren sphere

astronomy

Learn about this topic in these articles:

interstellar medium

  • Hubble Space Telescope
    In astronomy: Investigations of interstellar matter

    …II region, known as a Strömgren sphere. Such regions are strong and characteristic emitters of radiation at radio wavelengths, and their dimensions are well calibrated in terms of the luminosity of the central star. Using radio interferometers, astronomers are able to measure the angular diameters of H II regions even…

    Read More
Britannica Chatbot logo

Britannica Chatbot

Chatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.