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The question of whether or not we are alone in the galaxy is one that has fascinated everyone from mathematicians to conspiracy theorists. But, if extra-terrestrial life forms are abundant in the Universe - as some people believe - why have they not been in contact?
From Doctor Who to Superman, ET to Marvin the Martian, fiction has regularly brought aliens to Earth as friends or enemies but, as yet, no-one has proved they have ever seen an alien apart from on film or TV.
In 1960, a radio telescope was pointed out into space to listen for signs of extra-terrestrial intelligence, trying to add scientific fact to the question "is anybody out there?" But 50 years on, nobody knows the answer to it. "It's probably the most important question there is," says Dr Frank Drake, who was a pioneer of radio astronomy and is considered the father of Seti - the Search for Extra Terrestrial Intelligence. "What does it mean to be a human being? What is our future? Are there other creatures like us? What have they become? What can evolution produce? How far can it go? "It will all come out of learning of extra-terrestrials and this will certainly enrich our lives like nothing else could."
Back in 1961, Drake created a formula to work out how likely it was that we are alone in the galaxy, a formula which still underpins how experts view the question today. The so-called "Drake equation" estimates the amount of civilisations able to communicate with Earth. And the figure Drake and his colleagues estimated in 1961 was 10,000.
Originally posted by realitydiscovered
Because they are among us and they know everything about us.
Originally posted by qalameid
reply to post by CastleMadeOfSand
Unless aliens have found something other than the electromagnetic spectrum to communicate, which in itself is unlikely,
Originally posted by qalameid
then radio waves would make an excellent candidate. Radio waves are technically the longest wavelengths and can travel the greatest distances, and the Earth's atmosphere happens to be transparent to a good portion of radio, which means we can easily receive them without distortion. Granted, there are a lot of radio emitters in space so it would be hard to tell what is astronomical in nature and what is artificial.
Originally posted by anon72
We, humans, have already proven that life can exist off of Earth (by our own Space adventures, moon landings, space station etc. LIFE off of the planet earth. Can be Done.
I hope I live to see the day when it is let known that they exist.