I assume you mean heat transfer. The answer is radiation.
That refers to radiation.
convection requires a medium to travel. In space there is no air but, a vacuum. Therefore direct heat from the sun is radiation as it does not require a medium to travel.
radiant For one thing, it's how heat energy from the sun reaches us.
Insulation is not a method of heat transfer.
Conduction is a method
heat transfer
Contact.
That refers to radiation.
No,the transfer of heat by the movement of heated fluid is called convection.
Radiation
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convection requires a medium to travel. In space there is no air but, a vacuum. Therefore direct heat from the sun is radiation as it does not require a medium to travel.
radiant For one thing, it's how heat energy from the sun reaches us.
Both conduction and convection require an intervening medium, but convection requires the medium to be able to move.
Contact Method
That depends, conduction does but radiation travels in waves so just goes through anything
Insulation is not a method of heat transfer.