{"id":51393,"date":"2025-09-02T07:07:08","date_gmt":"2025-09-01T22:07:08","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=51393"},"modified":"2026-07-08T04:28:47","modified_gmt":"2026-07-07T19:28:47","slug":"the-classroom-becomes-a-universe-making-a-diy-cardboard-planetarium-dome","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=51393&lang=en","title":{"rendered":"The Classroom Becomes the Cosmos! A DIY Cardboard Planetarium Dome (The Day the Room Filled with Stars)"},"content":{"rendered":"

I’m Ken Kuwako, the Science Trainer. Every day is an experiment.<\/strong><\/p>\n

How a Cardboard Box Turned an Entire Classroom into a Planetarium<\/h3>\n

Have you ever imagined switching off the classroom lights and suddenly finding yourself beneath a sky filled with thousands of stars? It sounds like magic\u2014but with a few sheets of cardboard and a little creativity, it’s surprisingly achievable. In this article, I’ll share the story of a cardboard planetarium dome that our school’s science club built from scratch.<\/p>\n

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The previous year, our school festival featured an interactive earthquake exhibit. When it came time to brainstorm the next project, someone excitedly shouted, “Let’s build a planetarium!” Everyone immediately loved the idea. It reminded me that, no matter the generation, there’s something timeless about looking up at the stars.<\/p>\n

Learning from the Real Thing<\/h3>\n

Our first step was to visit a real planetarium in Shibuya, where we studied not only the projection system but also the atmosphere that made the experience so immersive.<\/p>\n

Back at school, the students began researching how to build one themselves\u2014and made an exciting discovery. JAXA, Japan’s space agency, actually provides official plans for building a cardboard planetarium dome.<\/p>\n

The fact that an organization leading space exploration openly shares templates for homemade educational projects says a lot about the spirit of science. We immediately downloaded the templates and adjusted the scale to fit our classroom’s ceiling height.<\/p>\n

You can find the plans here.<\/a><\/p>\n

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https:\/\/www.kaguya.jaxa.jp\/ja\/document\/DomeProject.htm<\/a><\/p>\n

The website even includes miniature models and printable templates.<\/p>\n

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How generous is that?<\/p>\n

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Designed and Built by the Students<\/h3>\n

This is where the students really took the lead.<\/p>\n

Using calculators, they worked out the correct scaling, then ordered custom-cut cardboard with white interiors. The white surface reflects light much better, allowing projected stars to appear brighter and sharper inside the dark dome.<\/p>\n

It’s a perfect example of how even something as simple as choosing cardboard involves understanding the science of light.<\/p>\n

The cardboard cost roughly \u00a515,000, but having every piece pre-cut dramatically reduced assembly time.<\/p>\n

From planning and purchasing materials to construction, the students handled almost everything themselves. My role was simply to offer occasional advice. Before long, we had completed a full-sized planetarium dome large enough to cover nearly half of the classroom.<\/p>\n

Materials and Equipment<\/b><\/p>\n