We love this arty, edible activity that's brilliant for toddlers and preschoolers. It only takes 15 minutes and – apart from a bag of Skittles – only requires stuff you already have round the house.

A nebula with rainbow swirls that make a plus-sign shape That hydrogen-bomb-like event is called a nova. A similar event likely created the colorful nebula, called Cederblad 211, around R Aquarii ...