Radiation
¥Any object that has a temperature greater than 0 K, emits radiation.
¥This radiation is in the form of electromagnetic waves, produced by the acceleration of electric charges.
¥These waves donÕt need matter in order to propagate; they move at the Òspeed of lightÓ (3x105 km/sec) in a vacuum.
Radiation -
Any object that has a temperature greater than absolute zero (0 K), emits radiant energy.  The radiation is in the form of waves that have both electric and magnetic properties.  Thus, they are called electromagnetic wave.
The waves are produced by electric charges moving.
This means of energy transfer does not involve matter, but instead electro-magnetic waves that travel at 300,000 km/sec.  This is the major method of transferring energy from the sun to the earth, and at this rate it takes about 8 minutes for radiation to travel from the sun to the earth.