Select the most appropriate one-word substitution for the given group of words.
An optical device for projecting various celestial images and effects
Answer & explanation
Correct answer: option 3
The most appropriate one-word substitution for "an optical device for projecting various celestial images and effects" is planetarium.
- Auditorium is a large hall for public gatherings, such as a concert hall or a theater.
- Amphitheatre is a large outdoor theater with a semicircular seating area.
- Galaxy is a huge group of stars, gas, and dust held together by gravity.
The word planetarium comes from the Latin words "planēta," meaning "wandering star," and "-arium," meaning "place of." A planetarium is a building or room that contains a planetarium projector, which is used to project images of celestial objects onto a domed ceiling.