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Crewed Mission to Mars May Be Exposed to Unsafe Levels of Radiation, Study Warns_我的网站

A |     While scientists and science fiction authors alike have long dreamed of sending crewed missions to Mars, a new study suggests these plans may hit a snag – a big one.,The authors of a yet to be peer-reviewed study argue that the participants of such a mission to Mars would end up being exposed to radiation – namely, to “energetic charged particles from Galactic and Solar origin” – both while in transit and while on the planet itself, with the “thin spacecraft shield” and “rarefied Martian atmosphere” offering little in the way of protection.,The research team attempted to gauge the impact of a simulated 1,000-day mission to Mars on various organs of the human body, and concluded that astronauts may be exposed to radiation doses above one Sievert, which is over the safe limit set by most space agencies, New Scientist points out.,“We suggest mitigation strategies such as improved ways of shielding and dietary supplements, and make recommendations for the safety of astronauts in future crewed missions to Mars,” the team wrote in the abstract of their work available on the arXiv preprint server.,Ideas about how astronauts may be protected from radiation during a mission to Mars have already been proposed, such as the concept of a radiation shield comprised of a fungus found growing at the Chernobyl Nuclear Power Plant.,Last year, one architecture studio even unveiled a project for a self-sufficient and sustainable city that would be built on the red planet itself.。    Colombo, Oct 19 (UNI) President Ranil Wickremesinghe is as corrupt as any other politician and he cannot save Sri Lanka from the present economic crisis, the leader of the country's largest leftist group said in remarks published on Wednesday.
Anura Kumara Dissanayake of the Janatha Vimukti Peramuna (JVP) also said that the mass protests in Sri Lanka failed to achieve its aim of capturing power although it forced President Gotabaya Rajapaksa to flee "for want of proper leadership and planning", The Island newspaper reported.
Dissanayake has said ‘Aragalaya’, as the mass protests against Sri Lanka's unprecedented economic mess was known, failed "for want of proper leadership and planning though it compelled Gotabaya Rajapaksa to give up executive powers".
He pointed out in a television interview that although the Rajapaksas’ power collapsed, "they were able to quickly regain, and consolidate political power, by installing UNP leader Ranil Wickremesinghe to complete the remainder of Gotabaya Rajapaksa’s term".
The JVP leader added that the incumbent Wickremesinghe administration was as corrupt as successive Rajapaksa administrations.
He felt that having forced Gotabaya Rajapaksa to flee Sri Lanka, the protest should have been diverted towards Parliament and force the government to dissolve it and call for a fresh election.
Because of this failure, the Rajapaksas succeeded in regaining political power, he added.
Commenting on former Army chief and MP Sarath Fonseka’s assertion that the ongoing anti-government struggle may lead to another armed rebellion, the JVP leader emphasized that his party wouldn’t go on that path again.
The JVP launched insurgencies in 1971 and 1987-89, leaving thousands dead.
Asked to explain the JVP's strategy, Dissanayake said they believed that the government should be relentlessly pressed until it called a general election.
“We’ll secure power through elections,” he said, warning the electorate not to be deceived by the Rajapaksas and Wickremesinghe again.
Dissanayake alleged that the the leader of the main opposition Samagi Jana Balavegaya (SJB), Sajith Premadasa, "was also part of the utterly corrupt political party system that ruined the country".
"(Premadasa) as well as a vast majority of those around him cannot absolve themselves of waste, corruption, mismanagement and irregularities though they now pretended to be paragons of virtue," he added.
UNI MR。

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