There are many problems to search for extraterrestrial life forms.

"Artist’s conception of an M dwarf planetary system, where methyl bromide is more likely to be detected. Credit: NASA/JPL/Caltech" (SciTechDaily.com/ A Better Way To Search for Extraterrestrial Life)

If extraterrestrial lifeform is primitive like algae or bacteria researchers must search for the products of those organisms' metabolism. And the biggest problem is that exoplanets that can host life are very far away.

Researchers have no information on what kind of creatures they should search for. Or what those primitive aliens are eating. Without any bacteria, samples are very hard to make any kind of model that those researchers must search for.

And for those models, the researchers must use terrestrial bacteria as the model. So when we are thinking of those hypothetical bacteria as organisms that lived billions of years on some planet those organisms would be fully adapted to their home planet.

In some scenarios in the deep oceans of some exoplanets live organisms with the capacity to make oxygen by using electric cells and electrolysis. But even if those extraterrestrial fishes seem like fish they don't have any other connections with fishes on Earth. Except both of those organisms are living in the water.

There is a possibility that some extraterrestrial aliens have green or red skin. That makes their skin photosynthetic. The green skin means the alien species would have chlorophyll in its skin cells. And red skin means that the alien has the same molecule. That makes purple photosynthetic bacteria photosynthetic.

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There is the possibility that we already have alien transmissions. But we cannot separate the data from cosmic background noise.

That is one of the most interesting scenarios of the SETI program. Things like BLC-1 and Wow! signals are interesting. And the problem is that they happened only once.

But the fact is that use of hydrogen's alpha line frequency is ineffective for data communication. In that frequency, the cosmic background noise disturbs information. And at least high-speed encoded data transmission is very difficult by using the hydrogen line's frequency.

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But when we are searching for an intelligent alien civilization. We must understand that the search for those aliens is a very difficult mission. Even if aliens use radio transmissions for communication by using synthetic radio frequencies searching for those aliens is extremely difficult.

And the reason for that is that radio astronomers have no permission to listen to those frequencies. Listening to synthetic radio frequencies is prohibited because of data security. This thing is one of the biggest problems in the SETI program. The synthetic radio frequencies are allowing better change for everyday data transmission than hydrogen's alpha emission line.

But for some reason, we just expect that hypothetical aliens are keeping contact with each other by using hydrogen lines in communication. That thing causes very bad disturbance for those radio transmissions. Of course, aliens must use the numeric system that we know that we can even separate the alien transmission from the background noise.

There is the possibility that we have alien messages but we cannot recognize them. So we cannot separate that purpose information from background noise. And the reason for that is we have no key to alien data transmission. But there is no confirmation for that allegation. And that is only a hypothesis.

https://scitechdaily.com/a-better-way-to-search-for-extraterrestrial-life/

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