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That is a good example for "un rato por favor". Can be two minutes but can also be "something" more 
modified 19-Jan-21 21:04pm.
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Long siesta !!!
I'd rather be phishing!
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And we wonder why Spain has financial problems.
Marc
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Now... if you look serious to the financial Problems, I think US has some more. But US has the more better infrastructure to print new $
modified 19-Jan-21 21:04pm.
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I always get a bit of a giggle when I read the following:
Why S&P Downgraded the US:
U.S. Tax revenue: $2,170,000,000,000
Federal budget: $3,820,000,000,000
New debt: $ 1,650,000,000,000
National debt: $14,271,000,000,000
Recent [April] budget cut: $ 38,500,000,000
Let’s remove 8 zeros and pretend it’s a household budget:
Annual family income: $21,700
Money the family spent: $38,200
New debt on the credit card: $16,500
Outstanding balance on the credit card: $142,710
Budget cuts: $385
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"He found there was no work to do there."
They didn't miss him for six years so I guess he has a point 
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I've been to Spain. They probably thought they were on a Siesta.
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Odd thought: suppose we could create an artificial gravity wave by some yet to discover method - could a craft then surf that wave at the speed of light?
Ok, ok, I'll stick with the APOD...
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I'm working on expanding my own gravity field as we speak. nom nom nom[^]
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I'm not buying it. This whole gravitational wave thing. You watch. A few years and they'll be admitting that it was a burping camel in Ethiopia that set it off. It's all far too pat.
But anyway, no. If they do exist they make such a tiny perturbation with such a weak force that the only thing that could surf on it would be a hydrogen atom or two. If the output from the collision of two black holes (a likely story!) is required to produce a wave of subatomic magnitude then it's pretty limited as a means of propulsion wouldn't you say (especially as the mass of any object would increase to near infinity at the speed of light!)
I am not a number. I am a ... no, wait!
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9082365 wrote: But anyway, no. If they do exist they make such a tiny perturbation with such a weak force that the only thing that could surf on it would be a hydrogen atom or two. If the output from the collision of two black holes (a likely story!) is required to produce a wave of subatomic magnitude then it's pretty limited as a means of propulsion wouldn't you say (especially as the mass of any object would increase to near infinity at the speed of light!)
Oh well, another idea blown to smithereens! (I knew about the infinite mass but wondered if using the wave would allow that to be circumvented in some fashion. Hmm; now I think about it some more...)
Anyway, what makes you think it's all hokum?
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9082365 wrote: If they do exist they make such a tiny perturbation with such a weak force that the only thing that could surf on it would be a hydrogen atom or two.
How do you know? Are you a theoretical physicist, or are you paraphrasing what you read somewhere?
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Slacker007 wrote: How do you know?
He felt a disturbance in the force.
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Duncan Edwards Jones wrote: He felt a disturbance in the force.
I bet he did. 
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Slacker007 wrote: Are you a theoretical physicist, or are you paraphrasing what you read somewhere?
Well:
The gravitational waves that rippled through the LIGO detectors created a signal equivalent to the waves distorting spacetime within LIGO’s arms by 10^–21 metres, or one one-thousandth of the diameter of a proton.
Now, anything that creates a distortion one one-thousandth the width of proton, well, you'd need a pretty small surfboard to surf that.
More[^]
Marc
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I find the title of that article very offensive on so many levels. 
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Well, at least it's better than:
"Social waves found emerging from imminent unicorn mergers."
Marc
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Well there is always one who spoils the fun by using intellect.
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9082365 wrote: If the output from the collision of two black holes (a likely story!) is required to produce a wave of subatomic magnitude
The amplitude of the wave here was 10-21 meters, from a signal source 1.3 billion light years away. A little attenuation with distance is to be expected, no?
Software Zen: delete this;
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Gary Wheeler wrote: A little attenuation with distance is to be expected
Of course. But the theoretical maximum amplitude of gravitational waves, such as those emitted in the Big Bang itself, is only 10-5. It is, as you might expect from the generally weak force that gravity is, a very small effect requiring an inconceivably large source event. Any attempt to produce a gravitational wave intentionally without destroying at least a couple of star systems would result in one no better than trillions of times weaker still.
I am not a number. I am a ... no, wait!
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If you've got folks in your neighborhood who's idea of fun is to toss stellar mass black holes at each other and see what happens... it's time to move.
Software Zen: delete this;
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What if that 'gravitational' wave (yet to be created) turns out to be longitudinal instead of transverse? Would such a wave propagate at speed 'c'?
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Why can I add images to questions like you could do for articles? Please see this question.
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