LEGO’s newest Creator release proves that big ideas come in compact packages. The Space Exploration Telescope (set 31378) landed on shelves January 1, 2026, with 278 pieces that transform into three completely different models: a fully adjustable telescope with spinning planets, a working microscope, or a posable UFO. At $34.99, this set sits comfortably in impulse-buy territory while delivering the kind of replay value that keeps kids engaged long after the initial build.
What makes this set particularly clever is how it uses a single light brick across all three models. The telescope projects celestial images onto walls, the microscope illuminates specimens, and the UFO beams light from its underside. Three decorated lenses featuring a planet, star, and Moon add educational depth that goes beyond typical building sets. For parents seeking STEM toys that actually encourage experimentation rather than collecting dust on a shelf, this Creator set deserves serious consideration.
Designer: LEGO
That primary telescope build is surprisingly robust for being one of three options. Standing over 10.5 inches (27 cm) tall, it has a decent presence, and the tripod design is stable enough for actual play. The accompanying solar system, with its seven spinning planets, is a fantastic kinetic detail that adds life to the model. The projection feature is the real engineering win here. It takes what would be a static display piece and gives it an interactive purpose that cleverly mimics what a real telescope does: show you images of space. It’s a smart, elegant solution for a toy.
When you get tired of stargazing, the rebuild into a microscope shows the true genius of the part selection. The core housing for the light brick and lens assembly gets flipped vertically, and what was once a projection system becomes an illumination source. The same decorated lenses that projected planets now serve as makeshift slides, which is a brilliant way to teach kids about functional design and repurposing components. It’s a solid B-model that feels complete and intentional, demonstrating how form follows function with just a few clever reconfigurations of the same 278 bricks.
The final build, a UFO, is the set’s playful wild card. It shifts the entire theme from educational STEM hardware to pure science fiction. The designers did a great job creating a classic saucer shape with posable antennae and legs that flip out for landing. Here, the light brick serves as a simple beam underneath the craft, perfect for imaginative scenarios. This C-model provides an essential creative outlet, proving the set’s versatility extends beyond scientific instruments. It’s the build that lets kids take the parts and just have fun, which is arguably the most important function of any LEGO set.
The set is available now through , Target, and authorized LEGO retailers for $34.99. Batteries for the light brick come included, which saves you a trip to the store or the inevitable disappointment of discovering you need them mid-build. The recommended age is 8 and up, though younger kids with building experience could handle it with minimal supervision. Digital instructions are accessible through the free LEGO Builder app, which lets you zoom, rotate, and track build progress on your phone or tablet. LEGO’s website currently shows a 60-day shipping window, so if you’re ordering online, factor that into your timeline.
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