This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Both convection and conduction need a medium. Sun's heat reaches the Earth through radiation. There's vacuum between The earth and sun.
1 4 1
Conduction takes place in solid medium and convection in liquid medium and since there is no solid or liquid medium present between earth and sun so the transfer of heat takes place through radiation
1 5 1