The universe is huge. Are there creatures that are hundreds of millions times larger than humans?

Living things are the most wonderful and interesting things in the world. Their strange appearances and unique survival strategies are all fascinating.

Among the known life forms, some are very large, such as the blue whale, which can be more than 30 meters long; some are very small, such as bacteria and viruses, which are so small that we cannot see them directly with our naked eyes. If calculated by volume, humans are at least a hundred trillion times larger than bacteria, and viruses are even smaller than bacteria, usually less than one percent of bacteria. Among the known life forms, humans are neither big nor small, and we sometimes imagine that there are extremely huge creatures in the universe, and we are like humans to bacteria compared to them. This idea is wild, but it seems to have a certain possibility, after all, the universe is too big. So are there creatures in some unknown area of ​​the universe that are hundreds of millions of times larger than humans?

The universe is very large. The radius of the observable universe alone reaches 46.5 billion light-years, so from the perspective of the size of space, it is indeed possible for giant creatures to exist.

However, it is not enough to just consider the size of space. It is more important to think about this problem from the perspective of the laws of the universe. If the size of a human is magnified 100 million times, then the size of this creature is basically equivalent to the size of a gas planet, such as Saturn, Uranus or Neptune. Where does such a huge creature live? Can it wander around in the universe? I'm afraid not. The universe is empty and cold, and no known life form can survive in space. Maybe you will think of tardigrades. Indeed, this creature has a very strong vitality.

Tardigrades can withstand extreme temperature environments ranging from 151°C to -272°C. Even if exposed to an oxygen-deficient and high-radiation space environment, it is difficult for them to die. However, all this is conditional.

Tardigrades will dehydrate and enter a cryptobiotic state in harsh environments. Even so, it is impossible for them to stay in the extreme cosmic environment forever, and they will die after a long time. Why can't organisms survive freely in the universe? Regardless of the environment of the universe, the first point is that organisms need to breathe. Both anaerobic and aerobic organisms need to breathe, because the essence of breathing is a biochemical reaction. In this process, cells can obtain the energy needed for activities. Of course, breathing does not necessarily rely on oxygen, but there is not only no oxygen in the universe, but almost nothing. There is no way to breathe. How do organisms obtain energy?

If this hypothetical giant creature cannot roam directly in the universe, then it must live on a planet. But are there such large planets in the universe?

There are indeed extremely large celestial bodies in the universe, but the problem is that once the mass of a celestial body reaches a certain level, the internal pressure will ignite hydrogen nuclear fusion, thus turning it into a star. Living inside a burning star is beyond our understanding of life. In addition, we know that any objects with mass have mutual gravitational effects, so the larger the size of a creature, the more it will be overwhelmed. For example, a blue whale weighing 180 tons will be crushed to death by its own weight if it lives on land. Only with the help of the buoyancy of the sea can it counteract gravity.

So, in theory, the larger the size of an organism, the smaller the planet it lives on should be, because only in this way will gravity not crush it. Conversely, the larger the mass of a planet, the smaller the size of the organisms living on it should be.

This creates a paradox: if the planet is too big, the giant creature will be crushed by its own weight; if the planet is too small, there is simply not enough space to accommodate its body, so this hypothetical giant creature has nowhere to go in the universe. Now, let's ignore all these problems and assume that there is an extremely large planet in the universe, and the body of this creature is made of an absolutely rigid body and will not be crushed by gravity, then can it exist? It's still difficult.

The universe is so vast that nothing is impossible. Living things can appear in any way that we cannot imagine, but there is one thing that cannot be overcome, and that is obtaining energy.

Any movement requires energy, from as small as an atom to as large as a cosmic body, so any living thing needs to constantly obtain energy to maintain its normal operation, and the energy required by giant creatures is also huge. A creature as big as a planet cannot eat enough in the entire solar system for a few days. If there is only one such creature, it is still okay. If there are tens of thousands of such creatures, then the speed at which galaxies disappear in the universe should be visible to the naked eye. In summary, the size of creatures in the universe should be limited, and this limit is determined by the basic laws of the universe. Therefore, the probability of the existence of imaginary giant creatures is very low. However, nothing can be concluded, after all, we still know very little about the universe.

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