A lamp or a flame radiate light. (as do incandescent bodies) A radiator radiates heat, (as does any other hot body) And speakers or horns radiate sound ( as do any vibrating bodies)
They are stars that, like our Sun, radiate light. Then there are planets, like Saturn, Mars, Jupiter, etc, that reflects light shinning on them from our Sun.
An incandescent light will radiate at all frequencies.
Luminescence.
The earth does reflect light, but does not produce light.
Light, whatever the wavelength, does not need a medium in order to radiate.
Nuclear fusion. This is the process the sun uses to radiate all that light and heat.
The objects is black when no light reflect from it, hence, it absorb light very well. And at the same time, what can absorb light very well would radiate heat very well .
A verb with a meaning 'to shine with a sudden light' is illuminate.
No, all the stars radiate light equally in all directions.
Aurora borealis; the Northern Lights.
The definition of 'radiate' is to emit energy in the form of waves or rays. More specifically, 'radiate' also refers to energy being released in heat, gas or light form. Synonyms of the word include 'beam' and 'emit'.