TE
科技回声
首页24小时热榜最新最佳问答展示工作
GitHubTwitter
首页

科技回声

基于 Next.js 构建的科技新闻平台,提供全球科技新闻和讨论内容。

GitHubTwitter

首页

首页最新最佳问答展示工作

资源链接

HackerNews API原版 HackerNewsNext.js

© 2025 科技回声. 版权所有。

NASA confirms that the ‘impossible’ EmDrive thruster really works

198 点作者 fahimulhaq超过 9 年前

19 条评论

hannob超过 9 年前
Remember the faster-than-light neutrinos? Where they repeated the experiment multiple times with the same result? And nobody could find a plausible explanation for an error? And then, some months later, they found it was just a bad cable.<p>The sane rule of thumb on these kinds of experiments that seem to contradict basic physics is to assume it&#x27;s just an error in the experiment or the data calculations. Even if they did it multiple times. If this gets replicated by multiple independent teams worldwide with different experiments - then we can talk about new physics. But it&#x27;s important to understand how extremely unlikely that is.<p>The best you can learn from these kind of stories is how hard it is to get science right and how subtle errors can be.<p>Don&#x27;t get me wrong: I&#x27;d love to see some star-trek-like science becoming real. But it certainly doesn&#x27;t help to replace critical thinking with wishful thinking.
评论 #10506706 未加载
评论 #10506126 未加载
评论 #10507594 未加载
评论 #10507977 未加载
dzdt超过 9 年前
Headline is wrong. Correct topic sentence from article :<p><pre><code> &quot;In essence, by utilizing an improved experimental procedure, the team managed to mitigate some of the errors from prior tests — yet still found signals of unexplained thrust.&quot; </code></pre> No, the EmDrive does not work, they just haven&#x27;t yet figured out yet why they see the spurious acceleration in their measurements.<p>How do we know it doesn&#x27;t work? Because it violates conservation of momentum, without involving any of the extreme conditions where our current understanding of physics might break down. Basic physics is REALLY REALLY well tested. The chances that some new experimental configuration will expose new physics, without involving extreme energy concentrations or extremely large or tiny spatial dimensions, is so near to zero as to be negligible.
评论 #10505834 未加载
评论 #10505911 未加载
评论 #10507833 未加载
评论 #10505926 未加载
评论 #10505798 未加载
评论 #10507528 未加载
评论 #10508144 未加载
评论 #10505921 未加载
评论 #10505838 未加载
评论 #10505927 未加载
评论 #10506934 未加载
threeseed超过 9 年前
They didn&#x27;t confirm anything. It was merely a rerun of tests with more of the potential background causes mitigated. It is going to require a lot more tests before someone like NASA unequivocally states that this works. Especially given that this device relies on physics we don&#x27;t yet know about.<p>Worth reading here: <a href="http:&#x2F;&#x2F;forum.nasaspaceflight.com&#x2F;index.php?topic=38577.940" rel="nofollow">http:&#x2F;&#x2F;forum.nasaspaceflight.com&#x2F;index.php?topic=38577.940</a>
评论 #10505667 未加载
评论 #10505646 未加载
zellyn超过 9 年前
Why don&#x27;t they just put one of these things in space, with solar panels, turn it on, and see what happens? I guess the expense? It does seem the most expedient way to verify whether it works or not.
评论 #10507525 未加载
ohitsdom超过 9 年前
A lot of skepticism and negativity here, and I get that. But it&#x27;s exciting to watch science play out. This could be a huge discovery, or it could be crap. I love seeing the methodology in making each test more and more definitive by reducing variables and outside influences.
stargazer-3超过 9 年前
I love that the question of this technology&#x27;s validity is so grand it can be approached with Fermi&#x27;s Paradox. If such physics indeed exists, allowing interstellar expansion of life, then it increases our chances of detecting a signature of extraterrestrial life out there. Since we haven&#x27;t detected anything yet, it seems that EmDrive-tech is less likely to be real than if we would have.
评论 #10506046 未加载
saintgimp超过 9 年前
Seems like they need to do the hardware equivalent of a &quot;git bisect&quot; here. Instead of fiddling around with the current version of the device, trying to figure out if the observed effect is actually propulsion or just an artifact, someone should start tearing the thing apart, testing as they go, and find out at what point the observed effect goes away. That would probably be instructive.
Pyxl101超过 9 年前
Very interesting. I&#x27;ve been following this in the news for some time, hoping to learn the results of the latest research.<p>In previous tests it seemed like the significance of the effect was diminishing on each iteration, suggesting it might be experimental error. Anyone have a handle on how the latest results have changed? I don&#x27;t get a good sense from the article.
评论 #10505589 未加载
dandare超过 9 年前
Can someone please explain to me how does one creates new technology without having alt least one of the following? a) working prototype, b) consistent theory why the new technology will work.<p>In other words, what made Roger Shawyer believe his engine will work if he does not know how should it work nor have a prototype?
tdyen超过 9 年前
So if an EmDrive worked, what would it give us? A star trek impulse drive type thing? Or is it so low level an effect it would be useless?
评论 #10505656 未加载
评论 #10505680 未加载
评论 #10505895 未加载
评论 #10506047 未加载
评论 #10505939 未加载
SFjulie1超过 9 年前
Economical crisis are recognizable by the fact people tends to announce &quot;infinite energy source&quot;, &quot;cheap energy&quot;, or &quot;perpetual movement&quot; finally made true.<p>It is very interesting that while NASA that has been a clear &quot;cache nez&quot; during cold war to mask the use of nazis scientists and technologies for the USA they are now having a problem: space programs are considered to costly for their return other investment. Especially when you know the budget of ESA for rosetta&#x2F;philae mission compared to NASA&#x27;s budget.<p>Being on the grill, NASA is lobbying for even more costly mission to mars and support their own propaganda (intestallar, alone on mars...).<p>And now, miracle, they have an opportunistic new technology that could help achieve &quot;cheap easy journey&quot; to far away distance.<p>I can&#x27;t help to be a little suspicious. The timing is so perfect.<p>And as numerous comments are spotting there is no new technology until we can explain the causation. Because that is how science work: experiments should be consistent with theory, and vice-versa. Else this is religion or philosophy.<p>Maybe emDriver could be the proof God exists, but it is not likely. Well, if it existed, and since we would have a physical place where to search I would kill it anyway. I hate Gods, I prefer to drive my own destiny without a &quot;père&#x2F;mère fouettard(e)&quot; looking upon my shoulder like a stalker.
jrjarrett超过 9 年前
Woo hoo! The reactionless thruster! Next: Outsider hyperdrive!<p><a href="http:&#x2F;&#x2F;news.larryniven.net&#x2F;concordance&#x2F;main.asp?alpha=T#thruster" rel="nofollow">http:&#x2F;&#x2F;news.larryniven.net&#x2F;concordance&#x2F;main.asp?alpha=T#thru...</a>
alexandercrohde超过 9 年前
I almost want to flag this link for playing loud sound advertisements on page load, but I&#x27;m not sure that&#x27;s proper in this community. Is there not a better link to this content?
jcfrei超过 9 年前
Previous discussion: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10496638" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10496638</a>
dredmorbius超过 9 年前
I&#x27;d really like to see @dang et all at HN add digitaltrends.com to the penalised-by-default domains on HN. This is simply irresponsible hackery.<p>Rick Stella as well.
snarfy超过 9 年前
Momentum has velocity, but the velocity of light is the same in all reference frames. It seems like there is a conflict between conservation of momentum and special relativity. From the point of view of the light beam, nothing is moving.
评论 #10507323 未加载
评论 #10507607 未加载
peter303超过 9 年前
Cold fusion is the power source too.
transfire超过 9 年前
Caution is called for. After all, blowing past warp 5 can damage the space-time continuum.
selimthegrim超过 9 年前
I can&#x27;t name sources, but I have it in good confidence that this man (&quot;Sonny&quot; White) was forced to rewrite his dissertation by his PhD committee (mind you not his advisor, who was old and about to retire and had to be cajoled into line by the rest of them) because his first try was apparently all about this EMDrive stuff. This is a pathology.
评论 #10506249 未加载
评论 #10507597 未加载