Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "Scott Manley" channel.

  1. 1:54 I’m shocked, shocked I tell you, to discover that meteorites have been impacting here. — Your nodules, Captain. — Thank you.
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  2. But those diggers spend more time digging than moving. The main job of this thing involves moving.
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  3. But that was all miniatures, no CG.
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  4.  @antigravityworkshop1436  Oh yeah, that one little bit.
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  5. 0:13 The Daystar! AKA the light in the ceiling of that big blue room.
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  6. 1:04 “buta-di-ene”
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  7.  @uploadJ  If they’d done the reading, it could have saved them the months spent reinventing, imperfectly, what the pioneer had already achieved.
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  8.  @uploadJ  They didn’t have the budget to do get copies of some journals, but they had the budget to work it all out themselves?
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  9.  @uploadJ  Given the budgets that NASA had to work with? Really?
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  10. And that, ladies and gentlemen, was an object lesson in the saying “better to keep your mouth shut and be thought a fool, than to open it and remove all doubt”.
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  11.  @JKa244  Back again, under a different nym?
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  12.  @JKa244  I sense a commonality in the vacuousness of your arguments.
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  13. 1:16 Is that the fastest macroscopic man-made object ever produced?
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  14. 5:32 That’s several times larger than galactic escape velocity, just for comparison. By the way, is it “escape velocity” or “escape speed”? “Velocity” is supposed to have both a magnitude and direction. I guess the direction is implicit in both “orbital velocity” (parallel to the surface) and “escape velocity” (perpendicular to the surface) ...
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  15. 3:50 Stellar jewel-box. ;)
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  16. 2:10 There are some documents at Bitsavers describing the IBM 2250. Basically it had a CRT calligraphic vector display, with either 4kiB or 8kiB of onboard RAM (oh, the luxury), and a high-speed connection back to the mainframe. Plus a light pen and keyboard. The display was black-and-white only, no colour, not even greyscale, just white lines on a black background.
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  17. Blender is really the only one left that covers it all. All the proprietary apps have become narrow specialists.
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  18.  James Sloan  There was a bit more to it than just “trigonometry”. They couldn’t have done it without computers. For reference, go have a look at Buzz “Dr Rendezvous” Aldrin’s PhD thesis, where he went into this in detail: http://dspace.mit.edu/handle/1721.1/12652
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  19.  @DavidGao  And even though they can run Linux nowadays, they still have to emulate booting off punch cards.
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  20. 14:23 Yes, but the Chinese now have something cooler. That will last after this is gone.
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  21. They were ROM implemented as core memory. Whereas read/write cores could have their magnetization changed and sensed, these stored bits based on the presence or absence of individual wires. The piles of wires looked like ropes, hence the name, I guess.
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  22. 5:51 No, I think it’s just Bayes’ Theorem.
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  23. I wonder if Trump believes the Moon landings were real ...
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  24. 5:55 So Scotty’s waxing lyrical over “ion power” was a bit misplaced, then...
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  25. The company “Pixar” (from “Pixel Array”, I think) was named for that one hardware product--which they stopped making a long time ago. But they kept the name!
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  26. 1:15 Fun fact: the first Apple Ipods (remember them?) had little Toshiba hard drives in them. Yup, spinning drives (I think 1¼” diameter) in a device that would be moving around a lot, kept in people’s pockets or purses, likely dropped and bumped a few times. And still keep working, without a bunch of engineers back at Mission Control continuously monitoring things. The market window for these tiny drives was brief, before flash memory completely took over from them.
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  27. 15:30 Why would retrofitting a radar be out of the question? OK, looks like Arecibo had it included as part of the initial construction. But they were later able to upgrade the gantry structure; perhaps that would be doable for Tianyan as well?
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  28. You do know it’s the R³ part I’m talking about, right?
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  29.  @Eltaurus  You yourself wrote it as a Cartesian product. That means the P and R³ are separable. Do you know what that means?
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  30. 10:57 Before COSTAR went up to fix Hubble’s poor eyesight, I remember going to a presentation by a visiting researcher who was part of the team working on applying deconvolution techniques to sharpen up the Hubble images. Basically, they modelled the effect the aberration was having, and worked out how to apply an inverse transformation on the blurred images. It took a lot of number crunching, and presumably rounding errors would also limit the effectiveness, but they were able to get some quite decent, usable results.
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  31. A lot of images, e.g. many of those famous Hubble Space Telescope ones, are made at least in part from wavelengths other than visible light. So in these cases, yes, the assigned colours can become somewhat arbitrary.
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  32. So, your number one choice is between one stunning moment of major idiocy, versus the product of a thousand separate acts of minor idiocy--between an acute cockup versus a chronic one, if you like. Worth pointing out a slight cancellation between two of the separate items on your list: if the Shuttle had not existed, it would not have been able to conduct those Hubble repair missions.
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  33. 6:45 “Crude”? What a way to put down the Soviet space program...
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  34. No good for direct viewing as a terrestrial telescope; only two lenses means images will be upside-down.
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  35. 2:35 One AU is 150 million kilometres or thereabouts.
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  36. All subatomic particles have a magnetic field. This includes neutrons.
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  37.  @steeler180  Gravity.
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  38. There would be non-invasive ways of reading out the memory state, with external passive probes or something.
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  39. 9:26 I learned this phrase a while back: ”auto-da-fe”. Use it in good health. ;)
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  40. Lady Fly-Safe needs her own mic.
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  41. Presumably the problem was simplified a bit, over conventional CG ray-tracers, in that you didn’t have to deal with any actual bounces off objects. You just followed each ray from the camera until it hit an object (or exceeded some maximum range), and left it at that. No issues with diffuse versus specular materials, lighting etc.
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  42. Note the angle of the light: it is shining on the eastern rims of the craters, so the Sun is in the west. It’s late afternoon on the far side, heading towards evening and night. Meanwhile, here on Earth, we see the Moon a little past new.
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  43.  @rdfox76  Mine takes some knowledge to understand, you won’t find it in a YouTube search.
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  44. 12:00 People have been launching rockets for centuries, if not millennia. You’d think maybe he might have taken that into account.
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  45. Remember to pull the crank up, not push it down.
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  46. 10:01 Ah, you forgot to say “jemmin-ee” and went “jemmin-eye” instead. Which I think I prefer anyway. ;)
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  47. 4:58 As I recall, the main reason why Apollo flew an aerodynamic re-entry (with an offset centre of mass) was it gave them a wider range of incoming angles, and hence a wider safety margin. Otherwise the tolerance on the re-entry angle would have been very tight, and the risk of missing it (with consequent loss of the astronauts) too high.
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  48. Current would work, in the Earth’s magnetic field. I think one of the Shuttle missions did some testing with this.
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  49. There is also the issue that maintaining such a spin rate requires fuel to be expended. The natural state of such a body is to become tidally locked.
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  50. → Sheldon Robertson OK, so you send some internal mass spinning around one way to try to to spin the station the other way. That works for a while, until it becomes tidally locked again. So you speed up the internal spinning mass, and that restores the spin -- for a while. Then you have to spin it up some more. And more. And more.
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