planetarium
noun
plan·e·tar·i·um
ˌpla-nə-ˈter-ē-əm 
plural planetariums or planetaria
ˌpla-nə-ˈter-ē-ə
1
: a model or representation of the solar system
2
a
: an optical device for projecting various celestial images and effects
b
: a building or room housing such a projector
Examples of planetarium in a Sentence
Recent Examples on the Web
For the most accurate location-specific information, consult online planetariums like SkySafari Pro, Stellarium and The Sky Live.
—
Jamie Carter, Forbes, 1 Mar. 2025
Michael Shanahan, planetarium director at the Liberty Science Center in New Jersey, recommended looking for Mercury and Saturn soon after sunset, near where the sun went down — ideally with binoculars.
—Terry Dickerson, NBC News, 27 Feb. 2025
The Astro Trail includes five observatories, an aviation and space museum, a laboratory, and a planetarium, along with two state parks and one national park.
—Evie Carrick, Travel + Leisure, 14 Feb. 2025
The unique program featured hands-on activities such as Mars robotics, space settlement simulations, and portable planetarium sessions, making the program engaging and accessible to diverse youth across nationalities.
—Lauren Carpenter, USA TODAY, 13 Feb. 2025
See All Example Sentences for planetarium
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Jamie Carter, Forbes, 1 Mar. 2025
Michael Shanahan, planetarium director at the Liberty Science Center in New Jersey, recommended looking for Mercury and Saturn soon after sunset, near where the sun went down — ideally with binoculars.
—Terry Dickerson, NBC News, 27 Feb. 2025
The Astro Trail includes five observatories, an aviation and space museum, a laboratory, and a planetarium, along with two state parks and one national park.
—Evie Carrick, Travel + Leisure, 14 Feb. 2025
The unique program featured hands-on activities such as Mars robotics, space settlement simulations, and portable planetarium sessions, making the program engaging and accessible to diverse youth across nationalities.
—Lauren Carpenter, USA TODAY, 13 Feb. 2025
See All Example Sentences for planetarium
Cite this Entry
“Planetarium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetarium. Accessed 5 Mar. 2025.
Copy CitationKids Definition
planetarium
noun
plan·e·tar·i·um
ˌplan-ə-ˈter-ē-əm
plural planetariums or planetaria
-ē-ə
1
: a device that projects images of heavenly bodies on a ceiling shaped like a dome
2
: a building or room housing a planetarium
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