I think that's for momentum scaling. But impact craters generally scale with energy. A portion of the projectile's energy is transferred to the target and excavates a crater (O'Keefe and Ahrens, 1977). So the excavated crater scaling is really somewhere between momentum and energy. The pi-scaling relation's give a weak dependence of crater diameter on energy D ~ KE^0.22 (Melosh, 1989), or D ~ v^0.44. I believe depth-to-diameter ratio is more or less constant (Nagel and Fechtig, 1980), at least for simple craters. So you'd get a similar scaling for depth on velocity. Of course, 2 km/s is hardly even hypervelocity, so this scaling might not even apply yet.
(I know, these are some pretty ancient references.)
Should we really be using the title "czar" for someone who's supposed to be addressing potential hacking by _Russia_? I realize that term is commonly used as an informal title for these kind of positions (though I never really understood how that got started). But it seems to be particularly absurd here.
Oh, dysentery! Your family got one of those luxury diseases. We couldn't even afford the common cold virus. Dysentery implies you had access to water. We had to stand around all day with our mouths open hoping a stray raindrop would fall in.
I still use my TI-85, twenty years later. Sure, it's antiquated at this point, but by now I've just gotten so used to the layout and functions that I don't know what I'm going to do when it finally goes.
There's a TI-81 around here somewhere also; that one I don't use any more.
And when it arrives, you should scan it, so that you can archive an electronic copy as a backup. That way, if you ever need to replace it, you can just 3D print the whole thing.
The spacecraft is powered by a radioisotope thermoelectic generator (RTG), but that's not a reactor. The power comes from heat produced by the decay of Plutonium, but there is no sustained nuclear chain reaction involved.
I'm pretty sure the color movie is made of MVIC images. LORRI doesn't do color, but has much higher resolution. The LORRI images (and this movie) can all be found here.
Slashdot Mirror
"Comets. Icebergs of the sky! By jackknifing from one to the next at breakneck speed, we just might get some kind of gravity boost... or something."
I think that's for momentum scaling. But impact craters generally scale with energy. A portion of the projectile's energy is transferred to the target and excavates a crater (O'Keefe and Ahrens, 1977). So the excavated crater scaling is really somewhere between momentum and energy. The pi-scaling relation's give a weak dependence of crater diameter on energy D ~ KE^0.22 (Melosh, 1989), or D ~ v^0.44. I believe depth-to-diameter ratio is more or less constant (Nagel and Fechtig, 1980), at least for simple craters. So you'd get a similar scaling for depth on velocity. Of course, 2 km/s is hardly even hypervelocity, so this scaling might not even apply yet.
(I know, these are some pretty ancient references.)
Is it time to mention the obligatory xkcd comic for this topic?
https://xkcd.com/320/
Should we really be using the title "czar" for someone who's supposed to be addressing potential hacking by _Russia_? I realize that term is commonly used as an informal title for these kind of positions (though I never really understood how that got started). But it seems to be particularly absurd here.
Oh, dysentery! Your family got one of those luxury diseases. We couldn't even afford the common cold virus. Dysentery implies you had access to water. We had to stand around all day with our mouths open hoping a stray raindrop would fall in.
And this is the time to follow up with the one about the horse that walks into the bar and the bartender asks "Why the long face?"
The reason to do it in this order is to put Descartes before the horse. I'll show myself out.
I still use my TI-85, twenty years later. Sure, it's antiquated at this point, but by now I've just gotten so used to the layout and functions that I don't know what I'm going to do when it finally goes.
There's a TI-81 around here somewhere also; that one I don't use any more.
Is there actually any evidence (beyond the hacker's assertion) that any contract actually exists?
You say that like it's a bad thing.
I can play it with the Prime app on my iPad and use Airplay to mirror the display on the Apple TV.
It's just a name. Like the "Death Zone" or the "Zone of No Return". All the zones have names like that in the Galaxy of Terror.
Why not Venus?
Why not Zoidberg?
*slow clap*
Well, depending on the quality of the finished product, the tasters might have gone double blind AFTER the experiment.
+1 Correct.
Well, that's still more likely than an American saying "There's no substitute for cubic centimeters."
"Yes... yes. This is a fertile land, and we will thrive. We will rule over all this land, and we will call it... This Land."
And when it arrives, you should scan it, so that you can archive an electronic copy as a backup. That way, if you ever need to replace it, you can just 3D print the whole thing.
The spacecraft is powered by a radioisotope thermoelectic generator (RTG), but that's not a reactor. The power comes from heat produced by the decay of Plutonium, but there is no sustained nuclear chain reaction involved.
Yes, it is.
I'm pretty sure the color movie is made of MVIC images. LORRI doesn't do color, but has much higher resolution. The LORRI images (and this movie) can all be found here.
Ferengi? Don't compare us to those socialists!
I really liked him as Death in the animated adaptations of the Discworld novels Soul Music and Wyrd Sisters. He could actually speak in all caps.
Given that it's in a 375-mile orbit, Hubble was also (and still is) a pretty lousy paperweight.
FROM THE OUTSIDE, IT'S BLUE.
(Yes, that needs to be in all caps.)