Talk:Active SETI

Zaitsev makes a good point imo. If no one messages the others, they won't message back. It's called the Bystander effect or pluralistic ignorance, on a galactic scale maybe.24.56.247.13 (talk) 10:42, 7 January 2009 (UTC)

A note on an idea of using an array of sun shields to encode the message

Placing the shields near to the Sun, and in an orbit aligned with the galactic plane, would probabilistically maximise the chances of observers on the planets of other stars of Milky Way noticing the effect with tools analogous to the Kepler Mission's ones.

I think probably the most promising way to inform others about us is to design a specific Sun shield to modulate the light emitted by the Sun, because it is highly likely that we could manufacture (more thoughts on that at Space mirror (anti-global warming measure)), and it would be discoverable by civilisations capable of creating tools analogous to the Kepler mission's tools. The shield could be an array of planet-sized shields in an orbit in align with the galactic plane in a reasonably close orbit around the Sun, arranged in such distances as to create light intensity variations with varying intervals, identifiable as a message, and not misinterpreted as natural phenomenon.

For example, putting only TWO planet-sized shields arranged in orbit could produce the following sequence of TIME INTERVALS:

1,2,1,2,1,2,...

where the longer interval is nearly precisely two times longer than the shorter interval (i.e., the ratio not 1:2.1, but quite precisely 1:2.000000000), indicating that it is highly unlikely that this ratio 1:2 had occured naturally, and their confidence about an intelligent civisation could be increased arbitrarily with increasing the precision of the time interval measurement. If that doesn't give enough confidence, then THREE shields with precisely the 1,2,3,1,2,3,1,2,3.... perhaps would do.

By placing a few more of these space shields, you could even write even a highly unlikely approximation of a mathematical constant:

87.239.86.199 (talk) 16:35, 23 March 2010 (UTC)

Should it be considered Perceived Risk or Potential Risk?

Perceived risk implies that emotions are dominating over fact, versus potential risk which suggests that there may be real reasons to question the motives. DefaultChris (talk) 08:08, 13 June 2010 (UTC)DefaultChris

Error correction is much lower that quoted. For exemple, Arecibo is zero, since changing one bit change the meaning. Cosmic Call is better. I dont have the number in front of me but It was certainly not 46%, 15% would be more more realistic. —Preceding unsigned comment added by Yvan Dutil (talk • contribs) 12:45, 17 June 2010 (UTC)

That's nice but OR.

Kortoso (talk) 22:20, 17 November 2017 (UTC)

Altair (Morimoto - Hirabayashi) Message?

Nothing about this message on Wikipedia? What a pity. Kortoso (talk) 17:15, 11 September 2014 (UTC)

The first message to arrive...

...will be the Morimoto-Hirabayashi message sent to Altair (Alpha Aql) in 15 August 1983, which should have arrived in 1999. Kortoso (talk) 19:51, 20 July 2015 (UTC)

It's already listed in the table with all the the transmissions (it was added almost exactly 4 years ago), but unfortunately looks like there's no more info on Wikipedia. Might be worth starting a new article for it? —Pengo 10:03, 21 July 2015 (UTC)

Potential risk?

Is this a biased title for this section? Would "Controversy" be more fair and balanced? Kortoso (talk) 16:57, 31 July 2015 (UTC)

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Changed date format in 'Transmissions' table

Just for documentation in case errors become apparent in the future - I've used the following crude UNIX command to go from DD-MM-YYYY to YYYY-MM-DD and MM-YYYY to YYYY-MM (so sorting actually makes sense):

cat oldTable.txt | sed 's#\([0-9][0-9]\)-\([0-9][0-9]\)-\([0-9][0-9][0-9][0-9]\)#\3-\2-\1#g' | sed 's#\([0-9][0-9]\)-\([0-9][0-9][0-9][0-9]\)#\2-\1#g' > newTable.txt

Then I manually changed the description (from 'DD-MM-YYYY') and fixed one case involving '??' instead of numbers. Visual inspection of the changes seemed fine. I did not double-check where the numbers came from, or the weird <span style="display:none"> tags... 31.17.249.203 (talk) 16:48, 23 May 2017 (UTC)

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Table is not sorting correctly

If you sort by arrival date it's out of order.

1999 2022 2024 2029 2439 2030 2031

etc. — Omegatron (talk) 00:54, 17 November 2017 (UTC)

Some dates are in DD/MM/YYYY and some are simply in years. Kortoso (talk) 22:29, 17 November 2017 (UTC)

Transmission power?

Of all these transmissions, there doesn't seem to be anything concrete that spells out the transmission power (in watts I guess) of any of these METI attempts. Is any of this data available?

Kortoso (talk) 22:22, 17 November 2017 (UTC)

For instance, the "Sónar Calling" signals were beamed using the European Incoherent Scatter Scientific Association’s (EISCAT) 32-meter-wide (105-foot-wide) radio antenna in Tromsø, Norway.

If this is the EISCAT Svalbard radar (ESR) at Longyearbyen, on the Norwegian Svalbard archipelago, it transmitted in the UHF band at 498.0 – 502.0 MHz and peak power of 1.0 MW, with average power around 250 kW. That may be too weak to be distinguished from background noise.Kortoso (talk) 19:54, 20 November 2017 (UTC)

"A Message from Earth" - circular redirect

I'm not sure if anyone has noticed, but A Message from Earth redirects to the "Realized Projects" subheading, so linking it there and under "Transmissions" isn't any helpful. --2003:C4:DBCF:CB82:5CE3:5C5C:23F8:917E (talk) 08:50, 16 November 2018 (UTC)

Same thing for Hello From Earth. --2003:C4:DBCF:CB82:5CE3:5C5C:23F8:917E (talk) 08:52, 16 November 2018 (UTC)

how do I download SETI@home Enhanced BOINC Screensaver (v6.03) — Preceding unsigned comment added by 14.202.242.218 (talk) 02:03, 6 November 2021 (UTC)

Science Policy Project Article Upgrade

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