No, radiation does not require objects to be touching. In fact, it's the opposite! Radiation is the transfer of energy through electromagnetic waves, which can travel through a vacuum, like space, or through matter.

Here's why:

* Electromagnetic Waves: Radiation involves the emission of electromagnetic waves, like infrared, visible light, and ultraviolet radiation. These waves don't need a medium to travel and can move freely through space.

* Examples: We experience radiation every day. The Sun's energy reaches Earth through radiation, warming our planet. Microwaves heat our food through radiation.

So, while conduction (heat transfer through direct contact) and convection (heat transfer through fluids) require objects to be in contact, radiation does not.