Interested in everything connected with high technologies.
Inside the comet 67P/Churyumov — Gerasimenko there are no large voids. The mission of “Rosetta” the European space Agency made measurements that clearly demonstrated and solved the old mystery. Comets are icy debris left over from the formation of the planets 4.6 billion years ago. Spacecraft have visited a total of eight comets, and through these missions we pulled a picture of the basic properties of these space-time capsules. On some questions the answers were found, others appeared.
Comets, as we know, consist of a mixture of ice and dust, and if there were compact, gravity superior to water. However, previous measurements have shown that some of them have very low density, much lower than water ice. Low density means that the comet must be extremely porous.
But what is this porosity: due to large voids in the subsurface of the comet, or due to a more homogeneous structure with low density? Continue reading
Radiation risk for astronauts (radiobiological rationale)
The book covers a fairly wide range of materials concerning the sources of cosmic rays affecting astronauts in the implementation of interplanetary and orbital space flight, the quantities of the doses, the reactions of individual systems and the whole organism of animals and humans, and changes its stability when the complex character of radiation exposure in space.
The results of a 14-year experiment on a large lot dogs with simulation values of the doses and nature of dose distribution in time, which will affect astronauts during the flight to Mars. The considered models of formation of radiation damage in the hematopoietic system and the level of the organism during long exposures with varying dose rate, and the model of radiation mortality rate of mammals, describing accelerated aging and the changing age-specific mortality rates in a dose-and dose rate radiation exposure.
The book presents the algorithms and results of calculations of the radiation risk in the process of interplanetary and orbital missions throughout the life of astronauts, as well as data on possible sacramentoa life expectancy. The new approaches to the regulation of radiation exposure and justifies the new lower acceptable dose to astronauts during flights and during the whole professional activity. Continue reading
Recently a team of American researchers said that the now popular space tourism can be dangerous for climate of the planet. However, many scientists refer to this statement with skepticism. My opinion on this subject the correspondent was expressed by one of the leading experts on space travel, Professor Alexander Bolonkin.
Recently the journal Geophysical Research Letters has accepted for publication an article in which a group of researchers suggests that the currently popular space tourism can be dangerous for climate of the planet. Although it is not yet printed, about this study already talking in many leading online publications. All of the authors of the publications seem to fully support the researchers ‘ view regarding the danger of space travel.
What a project to promote space so scared of scientists from the Aerospace Corporation in Los Angeles (USA)? The fact that, in their view, flying back and forth space “shuttles” are left in the upper atmosphere is a lot of soot, which is a product of incomplete combustion of nuclear fuel. A group of researchers led by Martin Ross built a computer model of such contamination, based on information from business plans for space tourism in ha by 2020, and emissions estimates developed spacecraft SpaceShipTwo company Virgin Galactic’s. Continue reading