Fill a large bowl with plenty of ice and cold water and set aside. Place parchment paper or a slipmat on a large baking sheet and set aside.
In a small saucepan fitted with a candy thermometer , combine sugar, cornstarch, and water, until all the sugar is wet. Without stirring, allow the mixture to come to a boil on medium heat. You may swirl the mixture occasionally. Prevent crystallization by using a pastry brush to apply water along the sides of the saucepan to dissolve any sugar.
When the temperature reaches anywhere between 295-310°F, remove the saucepan from the heat and place in the ice water for about 20 seconds. Carefully wipe the saucepan dry.
Pour and divide the mixture evenly into 4 heat-safe bowls or measuring cups with spouts. Use wooden skewers to color each bowl with one of the food colorings.
Place a few lollipop sticks on the lined baking sheet, making sure to leave about 2-3 inches between each one.
Drizzle and overlap a small amount of each mixture and sprinkle some edible glitter to cover the ends of the sticks. Use a wooden skewer to fill in any gaps, and mix to resemble a galaxy. Place a few nonpareils to resemble stars.