How to Make Galaxy Slime (Space Slime)

Looking for a fun and easy way to make slime at home? This galaxy slime recipe is the perfect hands-on activity for kids to explore outer space while learning about chemistry! With simple ingredients, you can create colorful, glittery homemade slime that’s perfect for play and sensory exploration.

Kids love the idea of exploring outer space, so why not bring the universe into your hands with this fun and easy-to-make galaxy slime? This sparkly space slime is perfect for play and science exploration. It’s easy to add to a space theme week!

💡Note: I used half the quantity of the recipe below for each galaxy color and a full recipe for the black slime.

Supplies Needed:

• 1/2 cup Clear Washable PVA School Glue (3-4 bottles Elmers Glue)
• 1/2 cup Water
• 1/4 cup Liquid Starch
• Food Coloring (choose a variety of colors for the galaxy effect)
• Glitter/Iridescent Confetti Stars (optional but fun!)

Tip: Use separate plastic cups and craft sticks for each color to simplify the cleanup process.

Galaxy Slime Recipe

Watch the Video Tutorial:

Step 1: Mix the Base

In a bowl, combine 1/2 cup of water and 1/2 cup of glue. Stir until fully mixed.

Step 2: Add Color and Fun

Add your desired food coloring to the mixture. This is where you can get creative! Feel free to mix different colors like fuchsia, purple, orange, and turquoise blue for your own galaxy effect. You can also add glitter or iridescent confetti stars for extra sparkle!

Step 3: Activate the Slime

Add 1/4 cup of liquid starch to the mixture. You’ll notice the slime start to form immediately. Stir until you have a gooey blob. The liquid should be fully absorbed, and the consistency should begin to thicken.

Step 4: Knead the Slime

Start kneading the slime by hand. It may seem stringy at first, but keep working it and you’ll notice it becomes smoother and more stretchy. For even smoother consistency, place the slime in a clean container and set it aside for 3 minutes.

Step 5: Make Your Galaxy

To create a true galaxy effect, we recommend making a big batch of black slime. We added silver glitter and iridescent confetti stars to give it a deep space look. Then, mix in your other colors in small batches, creating a swirled effect by combining them together.

FAQ: Galaxy Slime Troubleshooting and Tips

Learn more about fixing slime here.

Q: My slime is too sticky! What should I do?

• If your galaxy slime is sticky, it’s likely that you need more activator. Add small amounts of liquid starch, stirring constantly, until the desired consistency is achieved. Don’t overdo it – a little goes a long way!

Q: My slime is too runny. How can I fix it?

• If your slime is too runny, it may need more glue or less water. Add an additional 1/4 cup of glue to thicken it up. Keep mixing until you see a firmer texture.

Q: How can I store my slime?

• Store your galaxy slime in an airtight container to prevent it from drying out. If the slime starts to get a bit too hard over time, just add a little water and knead it back to life!

Q: Can I make galaxy slime without liquid starch?

• Yes, you can substitute the liquid starch with saline solution and baking soda, though the texture may differ slightly. The slime may be a little less stretchy but will still be fun to play with.

Q: How do I get slime out of clothes and hair?

• To remove slime from clothes or hair, first scrape off any excess slime. Then, soak the fabric or hair in warm water and gently rub with soap to break down the slime. Rinse thoroughly and repeat if needed. Read more about getting slime out of hair and clothes here.

A Bit of Slime Science

Galaxy slime isn’t just fun to play with – it’s also a great way to explore chemistry concepts! Slime is a non-Newtonian fluid, meaning it behaves as both a liquid and a solid depending on the force applied to it. When borate ions (found in liquid starch or saline solution) mix with the polymers in the glue, a process called cross-linking occurs, which thickens the slime and gives it its stretchy texture.

In other words, slime is a mix of long chains of molecules that are tangled and bonded together. This process can be easily explained using spaghetti as an example: Just as noodles tangle together, so do the long polymer chains in slime to create a gooey, rubbery substance.

Tip: Try experimenting with different slime add-ins like foam beads to change its density and texture, or add a bit of shaving cream for a fluffy slime variation!

💡 Read more about slime science here.

More Fun Slime Recipes to Try

If your kids love galaxy slime, here are more slime recipes to try:

• Fluffy Slime
• Cloud Slime
• Clear Slime
• Glitter Slime
• Magnetic Slime
• Butter Slime
• Glow In The Dark Slime

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