SOLAR SYSTEM

Detailed explanation-1: -Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible. Only a small portion comes as visible light.

Detailed explanation-2: -Electromagnetic waves are not like sound waves because they do not need molecules to travel. This means that electromagnetic waves can travel through air, solid objects and even space. This is how astronauts on spacewalks use radios to communicate.

Detailed explanation-3: -Heat travels through empty space through radiation. Radiation is the transfer of internal energy through electromagnetic waves. These waves do not require a material medium for propagation and this allows them to transfer heat through empty space.

Detailed explanation-4: -Heat transfer by infrared radiation Infrared waves can travel through an empty vacuum such as space, so these electromagnetic waves do not need any material (called a ‘medium’) to travel through, unlike e.g. water waves or sound waves. All objects emit and absorb infrared radiation.