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I have the same question in the textbook the answer is that satellites use sensors to detect changes in the wavelength of light that is reflected from earth surface. They send this information to computers on Earth, which process into images.

Additionally

Early satellite communication used radio-transmitters to transfer imagery and data to earth ground stations. Some fixed satellites today use microwave radio relay technology to communicate with the ground which is complementary to that of communication cables.

Some of the commercial satellites that capture imagery of the Earth include GeoEye and DigitalGlobe, which provide the imagery used by Google Maps, Google Earth, and others.

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What are thousands of tiny dots that make satellites images called?

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