Timeline for answer to Given present-day Earth as we know it, how could I fake a radio transmission as coming from a distant star? by Mołot
Current License: CC BY-SA 3.0
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| Apr 13, 2017 at 12:52 | history | edited | CommunityBot |
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| May 30, 2016 at 16:48 | comment | added | RichS | @Mołot Several problems. A holographic surface does not emit radio waves; a hologram only exists by reflected light. Your "surface" would have to be thousands of kilometers across to fool the hundreds of radio dishes on Earth that are sensitive enough to receive alien radio signals. Such a surface would be visible to the unaided eye. | |
| May 30, 2016 at 9:17 | comment | added | Mołot | @JDługosz Hologram creates wave front as if it came from arbitrary shape. Point is simplest case. If "surface" is otherwise transparent, this "point" will look exactly as a light source placed where you want it to. Look here at one angle, stick is behind squirrel. At another, it is visible. As if these objects were there. Two observers, everything looks real. Limited to single wavelenght, but for purpose of one signal, that's enough. | |
| May 30, 2016 at 7:33 | comment | added | JDługosz | What about @richS' s comment on his answer regarding holograms? | |
| May 30, 2016 at 7:25 | history | edited | user | CC BY-SA 3.0 |
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| May 29, 2016 at 21:23 | history | answered | Mołot | CC BY-SA 3.0 |
