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We humans, are limited in our perceptions ...Eyes & Brain....

Some facts:

We are slow in capturing images. Time it takes, to view something in seconds, compared to other sensors, in a fast image capturing mode:

Eyes & Brain      Still Camera       Video Camera
1/50                    1/8000               1/100000

If the the object is faster than our Eyes & Brain, is it nonexistant ?


We are limited in the spectra we see, in nanometers, compared to other sensors:

Eyes & Brain        Silicon Sensor in Cameras
400 to 700            400 to 1100


View sheet.
Spectra

Diagram taken from the papers:
"Introduction to Environmental Remote Sensing"
Center for Remote Sensing and GIS Michigan State University
Copyright 
1999 David P. Lusch
Download link:
http://www.trfic.msu.edu/products/profcorner_products/SIVAM.pdf

Or download from this site:

sivam-1-3.pdf
sivam-2-3.pdf
sivam-3-3.pdf

Interesting links, regarding remote sensing:
http://www.esrs.wmich.edu/