438 days in orbit of the Earth
Saturday, 17 May 2014 19:12

"438 days in orbit of Earth" (Russia; January 1994 – March 1995) – experiment about duration human flight to Mars and back. Valery Vladimirovich Polyakov (cosmonaut-researcher, Doctor of medical sciences) was orbiting the Earth on the international space station Mir for 438 days, thereby setting a record for the longest stay in orbit of the Earth. The main objective was to prove the fundamental medical-biological possibility of flying to Mars and back. In total Valeri Polyakov flew 280 million km. Under the terms of the experiment it was necessary to constantly be in good psychological and physical the form, return to Earth and get out of the lander by himself. To maintain physical fitness there was used exercise equipment on the ISS and the suit mimics earth's gravity. During the experiment the astronaut has been irradiated in 1 x-ray per month. A total for 438 day of flight  Valeri Polyakov received a radiation dose of about 15 x-rays. In Earth orbit the astronauts from radiation, in addition to the walls of the ISS, protected the magnetosphere of the Earth. A threshold value on the ISS it is 37 x-ray, with further exposure the astronauts can get develop radiation sickness. During the experiment provided valuable biomedical data for long-term human stay in space on the ISS. After landing, the cosmonaut Valery Polyakov felt in excellent physical and mental shape and proved the possibility of a long flight to Mars and back within an acceptable level of radiation exposure.

"You can fly indefinitely. The basic motto and principle – as far as possible not to allow to adapt to weightlessness".