Make galaxy slime

What can we use instead of the commercial "slime activator" or star confetti if we can't find them?

If you don't have commercial slime activator, dissolve 1 teaspoon borax in 1 cup warm water and use about 1/2 teaspoon of that borax solution in place of the '1/2 teaspoon slime activator' called for in the instructions, and if you can't find star confetti use small sequins or punched paper stars to sprinkle on top.

My mixture is still sticky after I followed the 'Add 1/2 teaspoon slime activator' step—what should I do?

If the slime stays sticky after adding the '1/2 teaspoon slime activator,' knead the slime and add another 1/4 teaspoon of activator at a time while kneading until it starts pulling away from the bowl and becomes less sticky.

How can I change the activity for younger or older kids during the glue, coloring, and kneading steps?

For younger kids (3–5), pre-measure the '1/4 cup of white glue' and '1/2 teaspoon slime activator' and let them do the stirring, glitter-sprinkling, and pressing of star confetti, while older kids (8+) can measure, add the 3–5 drops of food coloring themselves, knead each slime to stretchiness, and experiment with different folding techniques to create complex galaxy swirls.

What are some fun ways to make the galaxy slime look cooler or more personal after the three slimes are made and folded?

To enhance the galaxy effect, substitute clear glue for the white glue before adding food coloring, mix in a tiny drop of glow-in-the-dark paint to one bowl, and fold the three colored slimes only a few times so you keep streaky nebula patterns before pressing on the star confetti.