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how do you know that an alien

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civilization would like to use a radio

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signal to communicate actually the

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universe has made it so that radio is

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the preferred method for interstellar

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communication and the reason for that is

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that in the space there are natural SOI

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sources of what we call noise or static

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which interfere with our communication

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systems and when that noise and Static

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is very intense it takes a much more

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powerful a large and more expensive

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telescope to create a communication link

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well it turns out the universe is

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darkest and quietest at the radio

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wavelengths we call microwaves we know

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that the extraterrestrials will know

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that it's not hard to know this and they

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like us will exploit these frequencies

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for very long distance communication all

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of our communications to spacecraft for

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instance are you done using microwave

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wavelengths the transmission of

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television programs to people's homes

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from satellites are set on these same

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wavelengths because the you can get the

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signals with a small dish on your house

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and that doesn't take much power from

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the satellite to send the transmission

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to television programs to you so that's

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why we favor searching for signals at

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the microwave wavelengths first we can

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detect the messages they use for their

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own purposes more easily there because

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the universe is dark and doesn't

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interfere secondly if they are

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intentionally sending us signals they

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will use these frequency bands because

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they will know that that's those are the

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bands where their signals will be most

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detectable and where we're likely to be

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searching now there are some people who

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say that

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the answer to the Arecibo message might

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have already actually come back to her I

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don't know if you've heard of this this

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is a formation of X that that appeared

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in 2001 near radio telescope in England

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and there is well there is a more detail

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of one year and also this is this is

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some private researcher who you see in

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the camera let's compare that now that

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it's really interesting to note that if

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you if you see the red you see the the

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figure man they're great what do you

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think of that is it like an homage to

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Europe or do you do you think it's

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possible that this is this could

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possibly be the message the answer to

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your message I think there is no chance

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whatsoever this is a legitimate message

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it's some kind of joke or a fun thing or

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maybe a challenge that somebody made to

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one another to somebody to do and their

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reasons two reasons for this good

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reasons one is the version of the

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message they have here which I'm about

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to hold up here that contains in it

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information that's clearly wrong

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such as the structure of the DNA

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molecule and some of the other parts of

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this message make no sense whatsoever or

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are chemically impossible the other is

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that as we saw in the original picture

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this message appeared about 100 metres

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away from a radio telescope now if you

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had come to earth to deliver a message

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you would have gone to the door of the

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radio telescope and knocked on the door

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and

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one of your books or something you

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wouldn't have gone out in the cornfield

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and spent a great deal of effort cutting

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down stalks of corn right you know well

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I what I do know is that they're

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intelligent yeah because they somehow

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got to earth if this is really from an

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alien and they will know better than to

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try to communicate with humans in this

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ridiculous way

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you