Welcome back. Last time we made the Big Dipper. This time we'll make the stars twinkle.

1. First, you want to add another costume to your star sprite with a different colour. This is what it'll look like when it twinkles.

2. Next, you'll want to create logic that randomly changes the sprite's costume every other second or so. This is how we'll get our twinkling effect.

To achieve this, use a Forever Loop and Wait a certain amount of time between the costume switches. Play around with how fast it happens.