Exitance

Exitance is a big word that talks about how things give off light, and how much light they are giving off. Imagine you have a light bulb in your room, and it's turned on. The light bulb is giving off light, and we can measure how much light it's giving off using something called a meter. The amount of light that's given off is the exitance. So, if the light gives off a little bit of light, the exitance is low. If the light gives off a lot of light, the exitance is high. Exitance helps scientists understand how much light is being given off by different things, like stars or planets, and it helps them measure how much energy is being produced by these things.