A fun fact! In astronomy, energy/time is also flux, and it's referred to as luminosity, which is the brightness of a star. Luminosity and color have a close relationship for main-sequence stars. Generally, redder stars are lower temperature, smaller, and have a lower luminosity, while bluer stars have a higher temperature, are larger, and have a higher luminosity.
A fun fact! In astronomy, energy/time is also flux, and it's referred to as luminosity, which is the brightness of a star. Luminosity and color have a close relationship for main-sequence stars. Generally, redder stars are lower temperature, smaller, and have a lower luminosity, while bluer stars have a higher temperature, are larger, and have a higher luminosity.