Re: What is Light? Does Space made off cold Light?

Hello, Frank. You have asked an amazing question, for someone at your age.
I will try to answer you, and hope I make the answer clear enough.

You might want to think of the universe as having 2 things:
     1) matter
         and
     2) energy

Matter can have 3 forms - gas, liquid, or solid. So, the objects around 
you, like the furniture in the room, are "matter". Water is a liquid.

Look around the room you are in.

If you think of the space inside your room - you can see through it to the
walls or furniture around it. But that space is not empty - it has air in 
it. Air is a gas that you cannot see - but you can feel that it is there, 
by feeling a breeze when you turn on a fan in the room.

There also is some energy in the room. Energy is a bit harder to explain, 
so let me start with examples. If you can see the furniture or the walls
in the room, then there is light in the room. Light is one type of energy. 

If you say something, then you have sent sound into the room. Sound is 
another type of energy.

If you have a television or radio on in the room, and it is working - then 
the television or radio is receiving radio waves. So, there are radio waves 
in the room. Radio waves are like light waves, but invisible.  

Energy can be thought of as something that can move or change things. When 
you pick up a book, you are using energy. When you throw a ball, you are 
using energy. When the ball hits a window and breaks it, the energy you put 
into the ball by throwing it went with the ball as kinetic energy (the 
energy of motion), then made a change in the window. 

Oh, by the way - please don't do what I just described. Just imagine doing 
it. Thanks.

When light energy hits your eye, it makes changes in matter inside your 
eye. These changes allow you to "see".

When sound energy hits your ear, it makes changes in matter inside your 
ear. THese changes allow you to "hear".

Anyway, I said that radio waves are like light energy, but cannot be seen. 
You probably won't understand the picture, but at 

http://members.tripod.com/~MaassMedia/wave8.html

 
is a picture that shows how radio waves and light and X-rays are all the 
same type of energy, but at different "frequencies". 

You can learn what "frequency" means at

http://members.tripod.com/~MaassMedia/wave104.html

which will use different frequencies of sound waves, rather than light 
waves, to help you hear the difference.

In fact, the different colors of light, red, orange, yellow, green, blue, 
and violet, are different frequencies of light. Light with just a bit lower 
frequency than red light is called "infrared". We cannot see infrared 
light, but can feel it as heat. Energy with a lower frequency than infrared 
is called microwave - the type of energy used in a microwave oven. 

Energy with a higher frequency than blue light is called ultraviolet. These 
are the "black lights" that you might find at some parties or in some 
stores, that make parts of some people's clothes seem to glow.

So, light is a form of energy, which you can see - but there are forms of 
energy like light that you cannot see, like radio waves, microwaves, 
infrared, ultraviolet, and x-rays.

Space is just emptyness. If you took all the air out of the room you are 
in, and were somehow still able to breathe - say, you were wearing the type 
of suit an astronaut wears - well, you would be in a vacuum. But, since you 
could see - there would still be light energy in the room. If you turned 
off all the lights, the dark, empty room with no air would be a lot like 
space.

I hope this helped you understand. No, there is nothing we call "cold 
light". Space is just emptiness - no energy like like, no matter like air.