Kosmisk stråling problem
Ydermere er kosmisk stråling et stort problem og er med til at forsinke en Mars-rejse.
Kosmisk stråling vil være et problem uanset om man er i dvale eller ej.
Kosmisk stråling:
http://da.wikipedia.org/wiki/Kosmisk_str%C...
June 11 2003, Super spaceships not far out:
http://www.iol.co.za/scitech/technology/su...
Citat: "...
Meteoroids aren't the only hazard; space is filled with radiation, too. Spaceships in low-Earth orbit are substantially protected by our planet's magnetic field, which forms a safe bubble about 50 000km wide centred on Earth.
Beyond that distance, however, solar flares and cosmic rays pose a threat to space travellers.
...
"It turns out that the [b]worst materials[/b] you can use for shielding against GCR [Galactic Cosmic Ray] are [b]metals[/b]," Bushnell notes. When a galactic cosmic ray hits a metallic atom, it can shatter the atom's nucleus -a process akin to the fission that occurs in nuclear power plants. The secondary radiation produced by these collisions can be worse than the GCR the metal was meant to shield.
...
Earth's surface is mostly safe from cosmic radiation, but other planets are not so lucky.
..."
Da metal ikke er godt, vil man lave rumskibe af plast i stedet:
NASA, Plastic Spaceships.
A "designer material" derived from plastic could help protect astronauts on their way to Mars:
http://science.nasa.gov/science-news/scien...
Citat: "...
August 25, 2005: After reading this article, you might never look at trash bags the same way again.
...
Most household trash bags are made of a polymer called polyethylene. Variants of that molecule turn out to be excellent at shielding the most dangerous forms of space radiation.
[ Læs: polyætylen gør ikke strålingen værre, men beskytter ikke mod strålingen ! ]
...
[b]Protecting astronauts from deep-space radiation is a major unsolved problem.[/b]
..."
Visse mikrober klarer sig fint i rummet:
http://da.wikipedia.org/wiki/Udenjordisk_l...
f.eks.:
Mikrober kan overleve rumtur:
http://ing.dk/artikel/34569





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