Space Zoo

  At present, all living in the space zoo are small and medium-sized animals, such as frogs, rabbits, cats, dogs, monkeys, chickens, fish, and bees. Although flies and mice are hated by humans, they have become good objects of research and have also become guests of the Space Zoo. However, large animals such as lions, tigers, elephants, etc., which are respected as esteemed guests in zoos on earth, have to wait for the opportunity because of the high cost of carrying them to the sky.
  Reproduction gravitational field
  now, let us look at the case of animal life in space now!
  Scientists placed hundreds of fruit flies in 3 corners of the Space Zoo. The gravity fields of these 3 corners are different. One simulates the ground, one is twice the ground, and the other is 5 times the ground. It was found that fruit flies like to go to the corner that simulates the ground gravity to lay eggs and reproduce; in places twice the ground gravity field, the fruit flies are sluggish and show sickness; and in the place where the ground gravity field is 5 times The fruit flies all died very quickly. In addition, when the spacecraft is flying under weightlessness, the fruit flies will lay eggs, but they cannot be fertilized and cannot reproduce offspring. The researchers concluded that the gravity field has a great relationship with the reproduction of offspring and the guarantee of survival.
  The space zoo is also equipped with 6 pairs of mice and 60 single male rats, allowing them to live in an environment that simulates the ground and two and four times the gravity field of the ground, respectively. It was found that the resistance of mice was greater than that of fruit flies, and none of the mice died in these three environments. However, the mice living in an environment with a gravity greater than the ground appear to be restless, and after 7 days, their muscles atrophy, showing a very serious illness. After returning to the ground, an autopsy revealed that the mucopolysaccharides in their muscles decreased, the cytoplasm density in parietal cells decreased, and the activity of acid phosphatase in the stomach increased. The mice under the simulated ground gravity environment are not only healthy as usual, but also two pairs successfully mate in space. The female mice also successfully conceive and give birth. The mice born can still live healthy after returning to the ground. The mice in other space environments have not given birth.
  The higher the animal, the stronger the adaptability
  There is also a group of wasps in the space zoo. In the simulated ground gravity field, the nesting of the wasps is basically the same as that on the ground, but the wasps nesting under 2 times the ground gravity field is obviously different from the former—the nest wall is thicker in the direction of gravity increase— -To counter the effects of increasing gravity. This shows that low-level animals like wasps will also respond to specific environments in space in order to survive. In addition, when 1.5 times the gravity of the ground, the wasps build their nests fastest.
  A group of chicks still live in an area where the space zoo has twice the gravity of the ground. After 18 weeks of living there, they generally lost weight when they returned to the ground, their kneecaps were obviously deformed, and muscles were strained.
  The two little rabbits had cataracts after they came back from “traveling” in space. The reason was that the rabbit eyes could not stand the radiation from space, and the heavy ions in the universe damaged the retina of the rabbit eyes. But the cat in the same area did not suffer from cataracts. It seems that the cat’s eye is more resistant to space radiation than the rabbit’s eye.
  In addition, the cats, dogs, and monkeys in the Space Zoo have good resistance. The monkeys can return safely without any “space sickness”; the dogs are basically healthy and returned. In contrast, the cats are in poor health. It can be considered that the higher the animal, the stronger the ability to automatically adjust to the mutated space environment.
  Aquatic animals more resistant to weightlessness
  in space, weightlessness experiments have fish and frogs to participate found that resistance to weight loss abilities of fish better than the frog, the frog’s resistance to weight loss ability is better than monkeys. This shows that the weightlessness tolerance of aquatic animals is generally better than that of terrestrial animals, while amphibians are in the middle. The reason for this remains to be studied. Researchers think that it may be that the cell structure of aquatic animals is looser and less sensitive to changes in gravity.
  Living in a space zoo can change the genetic performance of animals. For example, branchiopods hatched in space do not live long until the third generation. But the reproduction rate of Paramecium has increased by 4 times. According to research, the chromosomes in the genetic material have been mutated due to space radiation. As the cosmic environment can change genetic capabilities, some countries have now begun to establish a new discipline of space genetics.
  With the continuous development of science and technology, the day when humans live in “paradise” will not be far away.