Because that's the irradiance at the Solar Orbiter's closest approach (well, more like 17.5kW, hence getting on for). It's pretty amazing that you can have a s

Because that's the irradiance at the Solar Orbiter's closest approach (well, more like 17.5kW, hence getting on for). It's pretty amazing that you can have a spacecraft in nearly 20x direct sunlight, permanently and still have it actually work.