$*007*$#$/$These questions are In regards of radiative cooling and it's materials etc : please answer in Yes or no$.$ Please explain the detail:P$.$S: R$.$C means Radiative cooling:: and I am talking about subambient temperatures achievements::

Q$1.$ Is passive radiaitve cooling $90\%$ dependent on materials only right? Yes or no$?$ Like no external voltages or energy required right? No other mechanisms?

Q$2.$ The Prc principle is radiaitve heat exchange $,$ where heat from surface dissipated in space via atmospheric window leading to cooling of surface due to heat loss $,$ and subambient temp because the surface emits more heat then it absorbs$.$ is the $100\%$ right? Or am i missing something??. Can this phenomenon really reduce temp to $10-15$ Celsius? Yes or no$?$ How? Does this happen in real life?Could u give a daily life example of such a similar phenomenon? $/$ give real life analogy where it happens $.$

Q$3.$ Why absorptivity Important for IR emissivity in R$.$C $?$ True or false $,$ why $?($While absorptivity is undesirable for

a cooler it's essential for a material to absorb heat so as to emit it efficiently as IR$,,,$ eg$.$ Carbon black$)$ is this reasoning right? Isn't r$.$c main property to reflect solar $?$ So isn't this contradictory and can hinder cooling??? Yes or no$?$

Q$4.$ Are$/$ Do ceramics $($Ceramics are one of the oldest materials used for radiative cooling $)$ have high solar reflection and IR emissions? Thus they are used?

Q$5.$ Why does putting a dielectric $($insulator $)$ between metal layers in a multilayer structured radiative cooler improve cooling performance? Plz explain in detail

Q$6.$ How do photonic structures like nanophotonics, microstructures etc help improve IR emission $/$ Solar reflctivity? What is the physics behind it$?$ And does this help improve IR and reflectivity which consequentially improves R$.$C$??$ Yes or no$?$