Look around you there are colors everywhere. Right now I'm outside and I am surrounded by a field of bright green grass that glisten in the sunlight. Flowers of all color are sprouted from it, bright pink, deep purple and a nice baby blue are just a couple of them.
I bring this up because we see color everyday but really what is it? Well if you read the blog post where I talked about whether galaxies are moving away from us (Click Here to Read It) you'll have an small idea of how to answer this question.
To summarize the post briefly, light is actually a wave (wow!) and at different frequency of the light wave different colors of light appear.
At this stage of learning if you think really hard you'll actually be able to come up with your own answer to this question. So if you really wan't to pause and ponder, now is a good time to do that.
Okay, I'll set it up simple for you, read carefully. Because each color of light we see has a unique frequency, each colored item we view emits light solely at that frequency. For example, green grass only emits light at the frequency related to the color green.
The way that the item emits colored light is by having white light shone onto it. If you don't know white light is light from the sun that contains all the colors. What happens at this stage is that most of the white light gets absorbed into the object except for the color of light which the object is.
For example, picture a beautiful orange flower next to you. White light is shone onto it from the sun (doesn't only have to be the sun that makes white light, light bulbs do a decent job to). Almost every color from that white light is absorbed into the orange flower. The only color that isn't absorbed is the color orange, which gets reflected off and back into the world. Specifically back into your eye if you were looking at it.
Pick something around you that's colorful and ponder on this thought for a big. It's quite interesting.
Cheers.
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