![[Craft] Handmade Planetarium Idea Book](https://i.ytimg.com/vi_webp/PX5JzY5Kerg/maxresdefault.webp)
A sky full of twinkling stars… Doesn’t just imagining it fill your heart with romance?
Light traveling from far, far away gathers to create a beautiful carpet of stars.
Here’s a suggestion: why not enjoy that breathtaking scene to your heart’s content right at home?
What we’re introducing today is a collection of DIY planetarium ideas!
Everything can be made with materials you can find at local shops, so anyone can give it a try with ease!
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[Craft] Handmade Planetarium Ideas (1–10)
Planetarium with cardboard and paper plates
It’s a pointed, triangular device that projects a starry sky, made by combining black construction paper, aluminum foil, and a paper plate.
Cut the construction paper into a half circle, mark the star positions, and punch holes.
Cut out the center of the paper plate so a light bulb can be set in, and wrap the entire plate in aluminum foil to reflect the light.
Then roll the construction paper into a cone and set it into the paper plate; attach a light on the inside, and you’re done.
You can punch holes at random to highlight the beauty of the night sky, or add lines to accurately recreate specific constellations—that could be fun too.
box-type planetarium
A cardboard planetarium—its key feature is that you can project a starry sky wherever you like.
The setup is simple: attach black paper with holes punched in the shapes of constellations to a cardboard box with one side cut out.
If you place a light inside the box, the constellations will be projected onto the walls of a dark room.
Or, hold the box up to a room light and peek inside to casually enjoy the feeling of visiting a planetarium.
Since only one side is used for projecting the stars, you can freely decorate the other sides to create your very own planetarium device.
A planetarium made with plastic cups and sheet material
This is an idea where you place a black-painted plastic cup over a board-mounted light so that the light leaking from the cup looks like a starry sky.
It’s a planetarium that prioritizes beauty over accurately projecting star positions, so let’s create it while thinking about what shapes to cast onto the ceiling.
Freely draw patterns such as stars, the moon, or simple circles on the cup, then paint the surrounding areas black, leaving those designs unpainted.
A key point is to paint the black thoroughly so the illustrations are clearly projected.
Arrange the illustrations as you like and create your ideal starry sky.
Empty Bottle Planetarium
This is a planetarium that projects a starry sky by combining an empty bottle, a light, and black construction paper.
Because the light passes through the bottle material, it adds a gentle, warm quality to the glow.
The steps are very simple: cut the black paper to match the height of the bottle and the length of its interior, then punch holes according to your star layout.
Next, spread the paper along the inside of the bottle, close the lid with the light attached, and you’re done.
Place the untouched bottom on the desk so it projects light around the bottle, like a halo of stars.
A planetarium made from an empty box and aluminum foil
This is a planetarium that projects a starry sky by poking holes in aluminum foil placed over an empty box and shining light through them.
On the side opposite the aluminum foil, make a hole so you can insert a light.
In addition to freely punching holes to create constellations, layering cellophane will spread a colorful starry sky, which is also recommended.
Depending on the brightness of the light, it may not project onto the wall, so be sure to think about ways to intensify the light—such as using multiple lights or lining the inside with aluminum foil.
Planetarium craft kit
It’s an easy-to-make planetarium: just punch holes to match the constellations drawn on the unfolded template, assemble it, and place it on a light.
Not only the star positions and constellation shapes, but also their names are clearly labeled, so you can learn the shapes and names as you punch the holes.
There are many versions available, such as ones that project seasonal constellations or rotate to show all seasons, so it sounds fun to start by finding your favorite.
Because it’s simple, you can also get creative—like increasing the number of stars beyond the sample, or adding cellophane to make a colorful night sky.
cylindrical planetarium
This activity involves punching holes in a sheet of paper drawn with the arrangement of stars visible in the night sky, assembling it into a tube, and shining light from the inside to project the starry sky indoors.
The structure and angle of the paper tube are important: by setting a rotating tube at a slight tilt, you can effectively demonstrate how the real stars move.
The part attached like a lid on the tube represents stars visible in any season, while the stars that disappear when the tube is rotated are ones visible only in certain seasons—making it a great lead-in to learning constellations.
Since the stars in the night sky each have their own characteristics in brightness and size, it’s also recommended to be particular about how you punch the holes to faithfully reproduce their actual sizes.
Planetarium with resin
This piece is created by layering resin with decorative elements to build up an expansive planetarium-like starry sky and the shapes of constellations.
You’ll make parts that depict constellations and parts that express the sparkle of the night sky, then layer and cure them with resin tinted in colors that evoke the night.
Another key point is stacking resin sheets and films—their irregularity produces a dreamy, floating sensation reminiscent of a nocturnal sky.
You could craft it as an ornament themed around a planetarium, or aim for gentle, light-transmitting colors to enjoy a version where you shine a light through it and project a starry sky around your room.
Polyhedral Planetarium
It’s a three-dimensional planetarium made by assembling pentagonal paper with holes punched to match the positions of the stars.
You cut the paper into pentagon shapes, then draw a net of adjacent pentagons that can be folded into a polyhedron using those pentagons as guides.
After that, punch holes in each pentagon, assemble it, and place it over a small light bulb to complete the device.
You can enjoy either a pattern that faithfully reproduces constellations or a design-focused pattern with freely placed holes.
It’s also recommended to hang it and use it as a light.
Mini Planetarium
This is a compact planetarium device that lets you easily project a starry sky using your smartphone’s light.
Create the star field by punching holes in a sheet of black construction paper and rolling it into a tube—be mindful of the placement of the holes that let the light through.
If you also attach cellophane to the inside, the projected stars will look even more beautiful, so that’s recommended as well.
Next, cut out the bottom of a paper cup and wrap it in aluminum foil to make a reflective base, then attach the black construction paper you prepared—now it’s complete.
Secure it firmly over your smartphone’s light and project the starry sky in various places.