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

【twitter sex videos daily】NASA's DART mission to move an asteroid is crucial for humanity

It sounds like a movie.

NASA will soon test its ability to deflect a threatening asteroid away from our humble blue planet. On Sept. 26,twitter sex videos daily the agency will slam a spacecraft the size of a vending machine into a space rock the size of a great Egyptian pyramid. [Update Sept. 27, 2022 at 10 a.m. ET: NASA successfully crashed into the asteroid, a historic space event that you can watch.]

The sci-fi-like endeavor is called the DART mission, or Double Asteroid Redirection Test, which launched in November 2021. It's humanity's first-ever attempt to purposefully move an asteroid. The rocky target, Dimorphos, is not a threatto Earth, but the mission is an experiment to see how civilization could alter the path of a menacing asteroid, should one be on a collision course with our planet. 


You May Also Like

Though no knownasteroidof at least 460 feet wide is a threat for the next century, a future strike, at some point, is inevitable. So the $330 million mission is crucial.

"We are right now defenseless against any asteroid aiming for Earth," said Markus Wilde, an associate professor of aerospace, physics, and space sciences at the Florida Institute of Technology. Wilde is not involved in the mission.

engineers working on the DART spacecraftEngineers at Johns Hopkins APL building the DART spacecraft. Credit: NASA / Johns Hopkins APL / Ed Whitman

Slamming a spacecraft into Dimorphos may sound dramatic. But the goal is just to give Dimorphos a nudge. During a true deflection of an incoming asteroid, such a nudge would happen many years or decades in advance of the imminent collision. "That's enough time to make sure it misses Earth," explained Andrew Rivkin, a planetary astronomer at the Johns Hopkins University Applied Physics Laboratory and one of DART's lead scientists. Over years, a tiny alteration in an asteroid's movement adds up to a big change in the ultimate trajectory.

SEE ALSO: What we'll see when NASA crashes into an asteroid on purpose

This strategy, of course, requires knowing what's coming. In good news, astronomers have already detected over 27,000 near-Earth objects, and have discovered some 1,500each year since 2015. 

"We are right now defenseless against any asteroid aiming for Earth."

But in the coming few decades, many more rocks need to be found: Astronomers estimate that thousands of sizable asteroids over 460 feet wide remain unfound. Fortunately, astronomers have already located over 90 percent(and counting) of the rocks half-a-mile wide or bigger — the kind that could spell catastrophe for large swathes of Earth. But the smaller, more elusive rocks still have a strong potential to sneak up on us. A rock some 187 to 427 feet across swooped by Earth in 2019 and surprised scientists. Such an impact could be devastating. Some 50,000 years ago, an asteroid 100 to 170 feet across left a 600-foot-deep crater in Arizona. "A similar-size impact event today could destroy a city the size of Kansas City," David Kring, an impact expert at the Lunar and Planetary Institute, told NASA this year.

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!

"We need to be able to find these things early," emphasized Cathy Plesko, a scientist at Los Alamos National Laboratory who researches asteroid impacts and is working on the DART mission. "We're getting there, but we're not there yet."

a big impact from an asteroid in ArizonaThe 50,000-year-old Barringer Meteor Crater in Arizona. Credit: USGS / NASA / Joshua Stevens

The Impact

The DART spacecraft will slam into 525-foot-wide Dimorphoswhen it's 6.8 million miles from Earth (live images, sent back every second, will show the view as the craft approaches its target). But Dimorphos won't be alone. It's actually orbiting a much larger sibling, the half-mile-wide Didymos. 

For astronomers, this makes Dimorphos an ideal collision target. After the impact, which will spray rubble into space, scientists on Earth will use telescopes to gauge how much the collision (or "nudge") alters Dimorphos' orbit around Didymos. And that's the crux of the experiment: How much did we move the space rock?(Scientists hope to slow its orbit by several minutes, or even 10, over the course of a 12-hour orbit.)

NASA will capture extreme footage of the grand 15,000 mph impact. Ten days before the strike, the DART spacecraft will release a toaster-sized "CubeSat." The small box will trail DART by a few minutes, allowing astronomers to see exactly what happens as a plume of rock is blasted through space.

the DART spacecraft hitting the asteroids Dimorphos and DidymosA graphic showing the DART spacecraft and the Didymos asteroid system. Credit: Johns Hopkins APL

The Future

If NASA successfully slows down Dimorphos, it won't simply be an unprecedented, deep space achievement. It's proof to future generations that the planetary defense technique works. If a larger asteroid is discovered hurtling towards Earth in 2077, the same exact mission won't suffice, but space agencies can now better plan to deflect the incoming space rock. Maybe two spacecraft would have to be sent, said Plesko


Related Stories
  • If a scary asteroid will actually strike Earth, here's how you'll know
  • The mega-comet hurtling through our solar system is 85, yes 85, miles wide
  • Scientists find something exciting brewing in Enceladus' seas
  • The best telescopes for gazing at stars and solar eclipses in 2024
  • How scientists find the big asteroids that can threaten Earth

"It's the same principle. It would just be a matter of scaling it up," she said.

To grasp how to deflect a variety of asteroids out there — some are hunks of rubble, some are masses of metal, some are bizarrely shaped — NASA may have to run a series of DART-like collisions in the coming decades, noted Wilde of the Florida Institute of Technology.

the asteroids Dimorphos and DidymosAn image, created from radar and other data, of the asteroids Dimorphos and Didymos. Credit: Naidu et al. / AIDA Workshop

Yet one thing is clear. Deflecting an asteroid years before it arrives is an optimal solution for defending Earth from a looming threat. What we don't want is an emergency. That could mean resorting to risky defensive measures, like launching a nuclear bomb into space to blow up a fast-approaching 700-foot-wide rock. Recent researchbased on computer simulations found such a nuclear detonation could actually blast away most of the threat. But there are unknowns and likely unintended consequences, noted Plesko, like the potential spawning of innumerable bullet-like micrometeorites that could trigger a runaway cascade of debris and satellite collisions. That would destroy civilization's invaluable communications, weather, and scientific satellites.

A well-calculated asteroid deflection is preferable, and space scientists are thrilled the mission is about to launch. The $330 million price tag is well worth it, they say.

"It's definitely worth its money," said Wilde.

This story was originally published on Nov. 13, 2021. It's been updated with information about when the impact will occur and how to watch this unprecedented event.

0.127s , 12154.78125 kb

Copyright © 2025 Powered by 【twitter sex videos daily】NASA's DART mission to move an asteroid is crucial for humanity,Public Opinion Flash  

Sitemap

Top 主站蜘蛛池模板: 日日摸夜夜添夜夜添久久 | 午夜AV亚洲一码二中文字幕青青 | 国产a级午夜毛片 | 永久黄色免费网站 | 久久精品成人免费看 | 日本乱理伦片在线观看一级 | 国产精品综合一区二区三区 | 国产精品久久综合桃花网 | 国产成人精品午夜视频免费 | 亚洲视频在线观看一区二区 | 久久婷婷五月国产色综合 | 国产又色又爽又黄的免费站 | 人妻系列无码专区免费视频 | 无码高潮又爽又黄A片 | 波多野结衣bb | 人与动物xxxx毛片人与狍 | 国产午夜精品美女裸身视频69 | 一本久道久久综合丁香五月 | 国产精品精品国产一区二区 | 国产午夜视频 | 久久久久九九精品影院 | 在线观看免费黄色网址 | 成人爽爽激情在线观看 | 亚洲日韩精品无码专区加勒比 | 成人区人妻精品一区二区不卡网站 | 偷拍亚洲网友图片区 | 国产综合久久一区二区三区 | 2024国产m豆传媒 | 日韩欧美一级视频喷潮 | 欧美特级午夜一区二区三 | 国产日韩aⅴ无码一区二区三区 | 成人欧美一区二区三区1314 | 久久精品无码一区二区三区不卡 | 亚洲欧美日韩精品久久亚洲区色播 | 中文字幕在线有码 | 熟女视频人妻欧美国产精品麻豆成人a | 欧美日韩人妻精品一区二区三区 | 久久中文字幕人妻丝袜 | 亚洲精品乱码久久久久久中文字幕 | 中文字幕国内精品一区二区 | 高潮毛片无遮免费高清 |