Comets 101 − everything you need to know about the snow cones of space

When you hear the word comet, you might imagine a bright streak moving across the sky. You may have a family member who saw a comet before you were born, or you may have seen one yourself when comet Nishimura passed by Earth in September 2023. But what are these special celestial objects made of? Where do they come from, and why do they have such long tails? As a planetarium director, I spend most of my time getting people excited about and interested in space. Nothing piques people’s interest i