Technology
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I figured something cool was happening to allow them to use radar from the air. So it's not even radar, it's like, ELFdar.
Really weird they went for the "lightspeed" angle tho
for sure, I find most of the time science reporting actually makes it harder to understand what the tech does rather than explain it
In the spirit of dumbing down the plot to make sure viewers don't turn away, they end up making totally nonsensical (if not misleading) content.
I suspect that a lot of the time people doing science reporting have a fairly tenuous grasp on the subject themselves as well.
RF is still RF, the only difference between what they're shooting into the water to detect subs and what you're shooting into your hot pockets is output power and frequency. It's still radio detection and ranging, just at a frequency not typically used for it. Microwave frequencies are used for what one would consider to be typical radar applications, while extremely low frequency would be better suited for communications.
Infrared isn't red, though. Seems like it's worth making a distinction between different frequencies if the way it interacts with matter is different.