Add 4-5 drops of paint to each cup; using a different cup for each color of paint.
Fill mason jar ΒΌ of the way full with cotton balls, using your fingers to pull the cotton apart a bit before placing them in the jar.
Choose the cup with the lightest color of paint and pour in just enough of the paint mixture to soak the layer of cotton balls.
Add some glitter and stars.
Repeat steps 3-5 for the next three colors (continuing to work your way from lightest to darkest colors).
Use the wooden skewer to push some of the darker paint into the lighter paint and spread the glitter and stars around a little.
Screw on the lid and enjoy!
Notes
Layering Order: Start with the lightest color and work your way to the darkest when adding paint to the cotton balls in the mason jar. This will create a gradient effect, resembling the galaxy's depth.
Moderate Glitter: While it's tempting to go overboard with glitter, moderation is key. Too much glitter can overwhelm the colors and make the galaxy jar look cluttered. Add glitter and stars sparingly to maintain balance.
Blend Carefully: Use the wooden skewer to gently blend the colors and distribute the glitter and stars evenly throughout the jar. Be cautious not to over-mix, as it can muddy the colors. Aim for a subtle, celestial swirl effect.