These tiny (1.5 mm or less) being very tenacious. Tardigrades not how much cold as minus 193 degrees Celsius, and the unbearable heat to + 150 degrees. They do not care about their environment: vacuum or hydrogen sulfide. They are just waiting in the wings to awakening. All tardigrades are a bit aquatic animals.
Tardigrades feed on the plants on which they live, algae, and sometimes small animals. Spread passively — by wind, water, and various animals.
They are widely distributed across the globe, are found not only in tropical and temperate countries, but also in the far north and in the mountains (at altitudes of up to 6000 m).
Tardigrades can live without water for ten years in a state of suspended animation. A case where the moss taken from the desert after about 120 years after his withering put in the water, it came to life and tardigrades were able to reproduce.
These microscopic beings translucent first, it seems watching the inventor of the microscope, Anton van Leeuwenhoek in 1702. He has collected dust from the gutter on the roof of his house, the water added to it, and with great surprise found under the microscope as any living organism appeared in the dust.
In 1776, the Italian scientist Lazzaro Spallanzani repeated the experiment, and gave the name of the animal tardigrady (in Greek — tardigrades) for their leisurely slow motion.
Radiation for these little scary. Tardigrades that good, then the person's death.
Izluchenich power in X-rays 570,000 kills about 50% of exposed tardigrades. For a man a lethal dose of radiation is only 500 x-ray.
Perfectly transfer a half-hour stay in a vacuum.
In the experiment, Swedish scientists, tardigrades to bounce back into space. On arrival in orbit they are in a vacuum and were exposed to cosmic radiation.
After 10 days in the open space, almost all organisms were parched, but the spacecraft tardigrades have returned to normal and were able to bring the offspring.
These monsters would probably have seized our Planet by now if not for two things.
On the one hand, they are extremely small (the largest adult body length reaches 1.5 mm).
On the other hand, is very slow, they move — a rate of 2-3 mm per minute.