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Scientists warn that aliens may come to destroy us [Copy link] 中文

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Post time 2011-8-26 18:41:07 |Display all floors

Attracting Too Much Attention?

So we continue to listen out for the signal from aliens through ever more ingenious methods. But we are transmitting too. There have been numerous attempts at "Active SETI" or Messaging Extraterrestrial Intelligence (METI), where we transmit our presence to the cosmos. The most basic of these methods was to attach our information to the Voyager and Pioneer probes in the 1970s.

This space-age "message in a bottle" has a very limited probability of ending up in the hands of an alien species. However, more recent modes of communication have included beaming our own radio waves into space attempting to make contact.

It's also worth remembering that our planet started to get "radio noisy" when we started transmitting radio and television signals about 100 years ago. Some of these transmissions will have "leaked" into space.

Therefore, if anyone is looking for us within 100 light-years from Earth, they might have already heard us. However, 100 light-years is very small in cosmic distances. For a galaxy measuring 100,000 light-years across, our signal has only reached 0.1 percent of the Milky Way.

Okay, so what if we start blasting out signals advertising our presence? To assume alien civilizations will be friendly and welcome us with open arms seems grossly naïve. As Hawking points out, if there's one thing we've learned from our own evolution, although we might have the best of intentions, we've rarely "come in peace."

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Post time 2011-8-26 18:42:02 |Display all floors

The Human Menace

Mankind is all about resources; imagine if a more advanced civilization sees Earth as a bountiful supply of sustenance and sees our civilization as nothing more than ants crawling over a big juicy apple. Wouldn't they just wash us off?

And so this is where Hawking leaves us, pondering our fascination with broadcasting our presence into space. Wouldn't it just be better for us to stay as quiet as we can, listening rather than shouting from the rooftops?

Personally, I think Hawking has a point. Although it might take hundreds, thousands or even millions of years for our signal to reach an intelligent “ear,” if that ear isn't a friendly one, we've basically decided our future-Earth's fate.

If there are any human decedents beginning to spread beyond our planet, it would be a real downer for an aggressive alien invasion to suddenly appear in response to our ancient transmissions. I'm sure we'd look back at our idiotic past-selves with anger when we realize we are living in the backyard of a vastly superior alien race intent on eradicating the human infestation that's spreading down their garden path.

On the other hand, we might contact a race of "huggy" aliens who genuinely want to be our friends. But on the off chance that we might get eaten, I'm with Stephen Hawking. Let's be careful about how we advertise ourselves, shall we?

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Post time 2011-8-26 18:43:17 |Display all floors

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Post time 2011-8-26 18:44:45 |Display all floors

Does anyone remember the horror movie Brain death

It was hilarious

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Post time 2011-8-26 18:49:27 |Display all floors

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Post time 2011-8-26 18:54:46 |Display all floors

Don’t talk to aliens, warns Stephen Hawking

------------------Hawking’s belief in aliens places him in good scientific company. In his recent Wonders of the Solar System BBC series, Professor Brian Cox backed the idea, too, suggesting Mars, Europa and Titan, a moon of Saturn, as likely places to look.

Similarly, Lord Rees, the astronomer royal, warned in a lecture earlier this year that aliens might prove to be beyond human understanding.

“I suspect there could be life and intelligence out there in forms we can’t conceive,” he said. “Just as a chimpanzee can’t understand quantum theory, it could be there are aspects of reality that are beyond the capacity of our brains.”

Stephen Hawking's Universe begins on the Discovery Channel on Sunday May 9 at 9pm

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Post time 2011-8-26 18:57:23 |Display all floors

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