posted on Apr, 17 2012 @ 11:40 AM
reply to post by stealthmonkey
I understand what you are saying, and when I was younger I even wondered that myself.
But please believe me when I say, it is correct what they tell us.
Think of your eyesight like a camera sensor, it collects light and the image is formed. In low light, not enough light can be captured and less is
seen, however, unlike your eyes, the camera can be adjusted to allow more light to enter, making darker scenes brighter.
But, as your eyes are just "sensors" this light needs to travel to them, that is why when it is dark, even though the object is still there, you
can't see it as there is no light bouncing off it.
Think of an infrared (nightvision) camera, it has to send out infrared light to bounce off an object so the sensor can receive any IR light bounced
back, however because the IR spectrum is not visible to our eyes, we need the cameras sensor to see it. The principle is the same though, just we can
see the EM radiation that is light.