Set as Homepage - Add to Favorites

日韩欧美成人一区二区三区免费-日韩欧美成人免费中文字幕-日韩欧美成人免费观看-日韩欧美成人免-日韩欧美不卡一区-日韩欧美爱情中文字幕在线

【white trash sex videos】Why NASA wants to test a nuclear rocket engine for a Mars mission

NASA and white trash sex videosthe U.S. military plan to test a nuclear-powered rocket engine in space as early as 2027, potentially revolutionizing how people travel the cosmos in the coming decades.

The two agencies will work on a nuclear thermal propulsion system, a technology NASA wants to use to send humans to Mars in the late 2030s. But the test mission — known as Demonstration Rocket for Agile Cislunar Operations, or the DRACO program — would not involve astronauts.

Advocates of nuclear-powered rockets have long-stressed the advantages: allowing spacecraft to travel faster, carry heavier loads of people and cargo, and use fuel more efficiently than the chemical-based rockets of today. Lately, the idea has galvanized, with $110 million budgeted for the project this year.


You May Also Like

It's not clear how much everyday people know about the technology and whether the project will renew concerns about nuclear disasters. NASA and defense leaders say the rocket will be safe for people on the ground, as well as eventually make space travel safer for astronauts: Faster trips mean they'll have less exposure to harmful cosmic rays.

But at the American Institute of Aeronautics and Astronautics conference, where the new collaboration was announced in Washington, D.C. on Tuesday, the moderator might have spoken for the collective conscience when he said, "Obviously, the public is going to say, 'You're going to put a reactor over my head?'"

"We are putting radioactive materials into space, but we have designed the entire process to be safe," said Stefanie Tompkins, director of the Defense Advanced Research Projects Agency, the research and development arm of the military, which is leading the overall program. "Part of the reason for doing it in space in a lot of ways is it's safer than having to do it on Earth."

SEE ALSO: NASA just inflated its new-age spaceship heat shield for Mars

How would nuclear rockets change space travel?

Experts described nuclear-powered rockets to Mashable as being a leap-ahead technology, on the level of horse-and-buggy stage coach to steam locomotive or landline telephone to smartphone. Right now, engineers rely on swinging around planets to get gravity boosts, the extra oomph needed to send space probes deep into the solar system. But nuclear power would free missions of having to wait sometimes years for the correct timing of orbits.

"You're opening up the outer solar system to scientific exploration. You don't have to wait for the planets to align. You'll have launch opportunities every year," said Dale Thomas, deputy director of the University of Alabama in Huntsville's Propulsion Research Center. "And, by the way, since we're talking about direct trajectories, you get there in about half the time."

With nuclear-thermal propulsion, getting to Mars could take as little as two months instead of nine, depending on the path taken, engineers said. And reducing the trip time would have the advantage of limiting the supplies needed for such a journey.

Why did the U.S. stop testing nuclear rockets?

The United States' last nuclear thermal rocket engine tests happened more than 50 years ago. During that time, the Los Alamos National Laboratory in New Mexico helped build nuclear rockets for NASA's Project Rover program. The program ended in 1972 when President Richard Nixon made the political decision to cut funding for human missions to Mars and instead focus spending on the Space Shuttle and research in low-Earth orbit.

A nuclear thermal propulsion system would pump liquid hydrogen through a reactor, where uranium atoms would split apart and release heat. This process, known as fission, would convert the hydrogen into a gas and eject it through a nozzle, creating thrust to propel a spaceship.

Mashable Light Speed Want more out-of-this world tech, space and science stories? Sign up for Mashable's weekly Light Speed newsletter. By clicking Sign Me Up, you confirm you are 16+ and agree to our Terms of Use and Privacy Policy. Thanks for signing up!
"You're opening up the outer solar system to scientific exploration. You don't have to wait for the planets to align. You'll have launch opportunities every year."

The "game-changer" in developing the technology today is a new form of uranium, which is not considered a weapons-grade material. That opens the door for commercial space companies to work on spin-offs after the test mission, said Pam Melroy, NASA's deputy administrator.

But this low-enriched uranium poses one of the biggest challenges for NASA. Materials in direct contact with the reactor fuel have to withstand over 4,600 degrees Fahrenheit, about half the temperature of the sun's surface.

Technicians preparing a Kiwi nuclear reactor nozzle for testingTechnicians prepare a Kiwi nuclear reactor nozzle for testing. Credit: NASA

Are nuclear-powered rockets safe?

In terms of safety, engineers say the nuclear systems would not be used at the launch pad at all. In fact, that's one of the most common misconceptions about the technology. In sort of a hybrid approach, chemical rockets would get the spacecraft off the ground. Then, once the ship had climbed to an altitude in space between 400 to 1,300 miles — well above the International Space Station — the nuclear-powered engines would take over. That's critical to ensure the material is no longer radioactive by the time it re-enters Earth's atmosphere, Melroy said.

If for some reason the chemical rocket blows up and the nuclear-powered engine ends up in the ocean, the nuclear hardware still can't "go critical," Thomas said. The in-space rocket system doesn't work until it reaches orbit.

Perhaps the greatest safety risks come into play during ground testing, a crucial step before launch. Engineers will need huge facilities that don't yet exist to capture the exhaust, a recommendation that came out in a 2021 independent report NASA had requested from the National Academies to study nuclear propulsion. New construction or modifications to existing facilities could cost billions of dollars.

A simulator testing nuclear-thermal rocket fuelA simulator at NASA's Marshall Space Flight Center in Huntsville, Alabama, tests nuclear rocket fuel prototypes. Credit: NASA / Mick Speer

Safe testing facilities are a consideration that didn't happen decades ago when engineers were working on earlier versions of these systems, said Roger Myers, an aerospace consultant who co-chaired the National Academies' study.


Related Stories
  • NASA's moon rocket blasted out jumbo clouds. Don't call them smoke.
  • SpaceX's mighty Falcon Heavy rocket blasts off on a secret mission
  • 6 things to know about NASA's moon-bound megarocket
  • NASA's monstrous moon rocket is an overpriced, political beast
  • A little-known U.S. spaceport shoots into the big rocket scene

"The U.S. government fired nuclear rocket engines in the desert in Nevada in the night, in the late 1960s and early '70s, and they fired them in open air," Myers said. "We're much more careful today."

Want more scienceand tech news delivered straight to your inbox? Sign up for Mashable's Top Stories newslettertoday.

Radiation exposure risks for astronauts

Perhaps surprisingly, experts say future astronauts would not be at greater risk of radiation exposure because of the engine — their bigger concern would still be deep space radiation from the sun. That comes from the design of the ship, Thomas said. NASA has a research grant to model how a spacecraft could be engineered to work with nuclear-powered rocket engines.

The crew would be at the front and the engine in the back, with a large hydrogen tank between them. Hydrogen happens to be an exceptional neutron absorber. Translation: "It's like your fuel is your shield," Thomas said. "I'd say you're actually in better shape with the nuclear-thermal" rocket than a legacy chemical system.

"It's like your fuel is your shield."

Another bonus for astronauts is that nuclear-powered rockets afford the crew chances to abort a deep space mission. On chemical engines, once a spacecraft were headed to Mars, there would be no coming back until the planets lined up again.

A nuclear rocket engine propelling a spacecraftThe DRACO spacecraft will test a nuclear thermal rocket engine. Credit: DARPA illustration

Nuclear thermal vs. Nuclear electric rockets

Other kinds of nuclear propulsion aren't being developed in the collaborative DRACO program, such as nuclear-electric power. A nuclear-electric rocket would use a reactor to create electricity like a small power plant. Myers believes NASA should invest in all of them because they have different advantages for space travel. But joining the Defense Department in this nuclear-thermal test project was wise to combine resources, he said.

There is also something in all this for people whose feet are planted on Earth. If scientists and engineers can develop a fuel and reactor that can take an extremely high temperature, that could lead to safer nuclear power plants on the ground.

"The reactor fuels that will work there, if you put them in a terrestrial reactor, they will make that reactor bulletproof," he said.

0.1458s , 10306.6796875 kb

Copyright © 2025 Powered by 【white trash sex videos】Why NASA wants to test a nuclear rocket engine for a Mars mission,Public Opinion Flash  

Sitemap

Top 主站蜘蛛池模板: 亚洲精品久久无码AV片俺去也 | 亚洲欧美日韩国产精品一区二区 | 亚洲欧美日韩国产精品26u | 欧美一区二区三区在线可观看 | 国产成人拍精品视频午夜网 | 日韩人妻无码潮喷视频 | 国产精品亚洲av综合成久久久久久三级 | 精品日韩欧美一区二区三区在线播放 | 成人欧美一区二区三区黑人免费 | 2024欧美国产在线视频网 | 国产制服丝袜亚洲日本在线 | a三级三级成人网站在线视频 | 国产成人av在线免播放观看 | 国产亚洲欧美日韩三级 | 成人自拍视 | 无码av无码天堂资源网 | 色情狠久久AV五月综合五月 | 91色桃 | 久久九九精品国产综合喷水 | 成人无码视频 | 久久只这里是精品66 | 国产成人精品电影在线观看 | 欧美日韩精品一区二区在线播放 | 18禁啪啪午夜剧场 | 激情欧美日韩一区二区亚洲乱码国产乱码精品精大量国产综合 | 亚洲女同视频 | 国产精美视频 | 波多野无码中文字幕av专区 | 永久品色堂 | 金梅瓶免费完整在 | 国产亚洲欧美一区久久国产亚洲欧 | 国内精品中文字幕 | 日韩视频在线观看 | AV综合色一区二区三区 | 天堂网在线最新版在线 | 欧美精品XXXXBBBB | 亚洲小说乱欧美另类 | 日韩经典亚洲一区二区三区 | 激情做人爱视频在线观看 | 亚洲精品无码无卡在线观看 | 精品亚洲成av人在线观看 |