Are there really aliens?

But our ideology determines that we are always looking for creatures like us, or living in the same frequency and material environment, or even looking for creatures with the same ideology more narrowly. Because everything is out of our ideology.

But sometimes I think that human sound waves are around 20HZ to 3400Hk, and the natural sound frequency range is not too wide. And we think it's high frequency, which is what we use to communicate. Then, if there really is such a creature whose communication frequency does not intersect with ours, then we can't know their existence at all. For example, an alien creature communicates with each other with ultra-low frequency, and their frequency may be 0. 1HZ, so that we can't perceive it at all. Of course, such creatures may be huge and have long communication distances. Some creatures may communicate at a very high frequency, but it is relatively small, and the signal will soon disappear. Wait, I think it's all possible. Regarding communication, if we can imagine that there may be many "aliens" using different frequencies, then aliens will have many forms of existence.

On the other hand, our ideology determines that our definition of aliens may be: moving, similar to the proportion of people, five senses and limbs. Of course, this may also be because it is described in all the science fiction movies I watch myself. People may not think so. But if in a world, they don't need air, or they breathe phlegm, or something else, or even something we haven't seen before, then it's understandable that they don't have a respiratory system, or they have a respiratory system we can't imagine.

If they move slowly, but the society is orderly, because their time measurement is so large that we can't observe them at all, then we can't understand that this is a creature. If they move so fast that our naked eyes can't stop to get their reflected light, then such things will not appear in our ideology. For example, a creature composed of many elements, but it is moving at a very high frequency. People may not be able to impress the brain at all, so we can't get their existence, but they do exist.

If the temperature needed for their life is very high or very low, which is far beyond the scope of our life survival theory, then we can't understand their mechanism and find their existence, because no one will go to the sun to look for life. Because we feel that living things can't exist at such a high temperature, we can't or can't reach such a place. But these are creatures in our ideology, not creatures in a broad sense. Then it is understandable that there are creatures that can tolerate high or low temperatures.