I don’t think you’ve added all the context, please tell me below if that’s the case!
Based on my interpretation of this website, I believe it's the astronomers. :)
Sorry can't help you I'm still on fractions.
The law of conservation of energy is an important law of physics. Basically, it says that while energy can turn from one kind into another, the total amount of energy doesn't change. This law applies only to closed systems, meaning systems that can't exchange energy with their environment
