The Day the Earth Stood Still sent to Alpha Centauri

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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby scrovak » Fri Dec 19, 2008 1:53 am UTC

icanus wrote:So it has will have going to have happened happened, but it hasn't actually happened happened yet?

edit: (to which the only appropriate response is of course: "It will be happened; it shall be going to be happening; it will be was an event that could will have been taken place in the future. Simple as that."


Buh?
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby Luthen » Fri Dec 19, 2008 10:40 am UTC

TomBot wrote:
Luthen wrote:
TomBot wrote:Heh, if they can receive terrestrial TV broadcasts (unlikely), and can decode analog but not digital TV signals (unlikely), what will they think had happened this February when a big chunk of a continent goes dark?
Your ambiguous use of tense words confuses and infuriates me. Is this Feb 08 or Feb 09 and what's happening?
I meant this coming February (2009), when the FCC shuts down analog broadcasts in the US. I also had some trouble devising the correct verb phrase to convey a future alien's hypothesis about an event in its past but our future. ("what will they think will have had happened"?) Grammar is the biggest difficulty in time travel.

However, as the analogue television bandwidths have been/will be auctioned off for use as more powerful mobile phone systems and wireless internet, the continent isn't going to go dark. However, the aliens will find an increase in randomness in the signal.

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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby '; DROP DATABASE;-- » Tue Dec 23, 2008 7:42 am UTC

Except those new signals will be digital. While analog signals have obvious patterns to them, digital ones are usually compressed and often encrypted, which gives them a very low entropy, making them much more difficult to distinguish from background noise. If the aliens happened to have radios that worked similarly to ours, but used the frequencies we use for analog video, right now they'd be hearing some pretty crazy shit on any channels we were broadcasting on that they weren't. When the signals switch to digital, that crazy shit will just be replaced with static.

Linux users: try 'cat /some/file > /dev/audio'. Try it with a BMP image and check out the neat patterns. Now try it with a JPEG or PNG image.
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby Maurog » Tue Dec 23, 2008 1:27 pm UTC

People, people, you are forgetting how bad space dissipates radio waves. Alpha Centauri is more than 4 light years away, normal radio/TV transmission won't last one light year in.

How far away could we detect radio transmissions?
For example, a TV picture having 5 MHz of bandwidth and 5 MWatts of power could not be detected beyond the solar system even with a radio telescope with 100 times the sensitivity of the 305 meter diameter Arecibo telescope.

It's nice of them to think of the poor aliens, but it's all wishful thinking (or blatant advertising, same thing really).
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby scrovak » Tue Dec 23, 2008 2:18 pm UTC

For all we know, they may be able to detect te patterns as a resultant form the radio-transmissions. For example, instead of trying to find a wet tennisball in a large room, instead look for the wet marks on the walls where it bounced. It'll tell you the impact, angle of impact, density, and angle of take-off, so you could tell everything about it. They may not be able to pickup the radio waves, but they may be able to discern the impact the waves had, and from that, reconstruct it.
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby Pez Dispens3r » Wed Dec 24, 2008 11:47 am UTC

I propose we send Alpha Centauri something more physical. Something that will demostrate that humans have culture, creativity, intelligence and taste, but something that we won't actually miss. Like France.
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby Vieto » Wed Dec 24, 2008 11:22 pm UTC

a poor choice if you want to show military might, though. See French Military Defeats.

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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby cephalopod9 » Mon Jan 05, 2009 12:50 am UTC

we. are. doomed.

Why can't we send aliens good stuff?

Didn't we send them Across the Universe a while ago? We should send them some Bach. Maybe some Rush too. Dunno about movies; the really good ones I can think of all seem to have high levels of us killing eachother.
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby SlyReaper » Mon Jan 05, 2009 10:04 pm UTC

Should have sent them the radio version of Hitch-hikers.
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Re: The Day the Earth Stood Still sent to Alpha Centauri

Postby Vieto » Mon Jan 05, 2009 11:55 pm UTC

better idea.

tell them not to turn our planet into a super-space-highway.


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