Going to the moon? Been there, done that — right? Some people might say that NASA's Artemis 2 mission is a repeat of the past, but they would be wrong.
Here's a thought experiment. Imagine looking at Earth from a distant star system, armed with a powerful telescope capable of capturing its reflected light. Could you tell the planet was alive? The answer, remarkably, might be yes and the clue would come from the colour of the plants.

