I was just reading a book to put my 4 year old to sleep, and there is a part where there is a satellite that took a picture of pluto, considering how far pluto is, how can the satellite send the images back to earth with that distance?
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It is fundamentally a radio. Obviously a sophisticated one. The transmitting end on the craft is not super powerful so the signal is fairly weak by the time it arrives to earth but, on the ground, this data is collected using very large radio wave detectors (think large satellite dishes) that can detect weak signals.
Think of it as wi-fi but on a very very large scale.
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