how is it possible for NASA to establish a signal/connections so far in outer space but we can’t find signals in certain rooms in our homes?
In: Physics
WiFi uses [these](https://www.tdtprofesional.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/a/n/antwifiqviart_foto.jpg). They’re omnidirectional and the ones meant for home use transmit at a tenth of a watt, give or take.
NASA uses [this](https://www.researchgate.net/profile/Mark_Johnston7/publication/242559177/figure/fig1/AS:298447807762432@1448166910147/The-70m-antenna-at-the-Goldstone-DSN-complex-in-California_Q640.jpg) (along with a bunch of other dishes “only” half the size of this thing). It’s quite directional and transmits at around **twenty thousand** watts.
The power difference alone makes the big dish hundreds of thousands of times more powerful, and it also only points at a certain part of the sky so it doesn’t waste energy by radiating it all over the place.
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