Astro Grow Pets

The Science Museum of Minnesota Verified independent store

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Step into a mini science experiment with Astro Grow Pets. Each kit contains a dissolvable rocket-shaped capsule that, when placed in water, reveals one adorable astronaut animal—su ch as a puppy, kitten, or fox—that grows in size over 24–48 hours. As the figure expands, children can observe the effects of osmosis and polymer science firsthand. If dried out, the pet will shrink and can regrow again, offering repeatable hands-on learning. Why you’ll love this kit:• Just add water to hatch and grow your mystery astronaut pet in 1–2 days• Includes one surprise astronaut animal figure inside a dissolvable rocket shell• Grows from about 3.5″ before exposure to several inches tall when hydrated• Demonstrates basic water absorption, volume change, and polymer science• Great for STEM curiosity, sensory play, and repeat hatching experiments Perfect for young explorers aged 5 and up, Astro Grow Pets combines biology-inspired surprise with chemical science in a fun, reusable format. Show more