Picture a mountaintop so dark you can just make out the outline of your partner’s body, but not his face. So dark you stumble, embarrassingly, on its rocky surface — a place illuminated only by keychain-sized
Imagine you are looking up into the night sky, when you see a bright flash. It only lasts for a fraction of a second. Now imagine trying to figure out what it was. This is the challenge astronomers face
That’s almost certainly not going to happen at this precise moment … but it could. Around a thousand times larger than our Sun, Betelguese is undeniably fading, but to astronomers it’s not surprising.