Never give up the search for extraterrestrial intelligence human footsteps, American fun science website is that aliens will exist, and perhaps they are under thick ice in the ocean of joy tour, according to the words of Nobel prize of physics Fermi: "they where?". There is a direct Fermi intelligent aliens, because the Milky Way system has been around for a long time, but there are a lot of habitable planet, for decades, many scientists in the questioning and Fermi launched an investigation, but unfortunately, we do not have enough evidence to prove any of a living planet until now, not to mention the wisdom of life on the planet. But scientists believe there must be aliens, and maybe they are looking at us somewhere.
Recently, astrophysicist Alan gave another answer to Fermi's question. He thought the galaxy had a lot of alien creatures. But due to the temperature, they probably lived in the surface of completely frozen seawater, unable to convey information to us.
Alan said, leading to the key problem of these creatures cannot be we found not space problems, but their planet itself, because of thick ice completely blocked their exploration outside the footsteps, if they have enough technology, for example, they can launch the radio or in manufacturing all kinds of lighting equipment, we also can not see, but can only capture some of the low frequency signal is easy to ignore.
And more importantly, how do they know what the world looks like if there are intelligent creatures that really exist under the ocean? If they do not reach the ice layer, they can't know anything about the outside world. Alan said he had given his idea to the magazine. He was cautious about whether his idea could explain the Fermi paradox. He thought that there must be more than one answer in the universe. What he did was to increase the possibility of solving the problem.