Timeline for Why is the ladder of the LM always in the dark side of the LM?
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Aug 22 at 1:49 | history | edited | Russell Borogove | CC BY-SA 4.0 |
deleted 1 character in body
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| Jul 15, 2019 at 6:57 | vote | accept | Manu H | ||
| Jul 10, 2019 at 13:07 | comment | added | RonJohn | Because Stanley Kubrick forgot to take the motion of the Moon into account when he built the stage set... :) | |
| Jul 8, 2019 at 17:31 | comment | added | Violet Giraffe | @qqjkztd: because Aldrin is subject to indirect illumination from the surface (moonlight!) while the [convex] surface itself cannot be illuminated by other points of the same surface? | |
| Jul 8, 2019 at 11:12 | comment | added | Russell McMahon | || PhD thesis - Dynamic thermal modeling for moving objects on the Moon || p7 lower - ... During Apollo 14 the MET was used to transport instruments and equipment ... MET was designed to sustain minimal temperatures as low as 216 K. ... during surface operations one wheel fell below that threshold temperature only because it was shadowed by the other parts of the MET ... The Astronauts had to adopt to this unforeseen condition in order not to loose the MET. ... by positioning the MET Stack Overflow no shadow was casted on the wheels. | |
| Jul 8, 2019 at 11:08 | comment | added | Russell McMahon | @KlaymenDK I'll see what I can find. The reason was that the shadow area is COLD - a wheel n sun and partly in deep shadow experiences significant differential heating which can lead to failure. That argument would seem to apply to anything shadowed - but that's what I recall I read. The mechanical cyclical load when rolling would not help. || This interesting thesis on bottom of page 7 refers to wheel/shadow issues with the Apollo 14 MET ("handcart" :-) ). That MAY be what I was recalling, but ollld memory says it applied to the Rovers. tbd. | |
| Jul 8, 2019 at 10:43 | comment | added | Russell McMahon | @qqjkztd This image shows the original plus a lightened version. I suspect that the black shadow has been further darkened - can't have original photos when they can be improved with editing. (I may be wrong). The 'black" is a very dark blue and is not quite homogeneous, but dies not have the variability I'd expect. [I often enough lighten up photos in this manner to check for editing]. || That said, the ground is horizontal and less liable to be highly illuminated by low angle reflected light. | |
| S Jul 8, 2019 at 10:43 | history | suggested | Russell McMahon | CC BY-SA 4.0 |
Added link to lightened + original images on imgur but not referenced from post.
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| Jul 8, 2019 at 10:41 | review | Suggested edits | |||
| S Jul 8, 2019 at 10:43 | |||||
| Jul 8, 2019 at 9:27 | comment | added | Manu H | @qqjkztd I think you lack some photographic background. It is not uncommon that the dynamic range of a camera make shadow dark enough to not be able to see details on it while white objects (the astronaut) light by a small reflector (here, the moon regolith) is bright enough to be seen (you can easily find reconstitution made with Lego on photographs' blogs and try to reproduce it yourself) | |
| Jul 8, 2019 at 9:21 | comment | added | user19132 | Bonus two: The shadow of the LEM is projected on both Aldrin and the lunar ground, why can't we see the ground? | |
| Jul 8, 2019 at 8:47 | comment | added | KlaymenDK | @RussellMcMahon Whaa...? Fascinating. Why was this by design, can you provide references? | |
| Jul 8, 2019 at 6:53 | comment | added | Russell McMahon | Bonus: Whenever the Luna Rover is stationary the shadows of the sun-side wheels never fall on the far-side wheels. This is by design and not an astounding coincidence. [Somebody will probably now produce a photos falsifying this :-) , but that was the aim.] | |
| Jul 8, 2019 at 6:00 | history | tweeted | twitter.com/StackSpaceExp/status/1148109462282153986 | ||
| Jul 8, 2019 at 4:10 | history | became hot network question | |||
| Jul 7, 2019 at 21:39 | answer | added | Russell Borogove | timeline score: 76 | |
| Jul 7, 2019 at 20:07 | history | asked | Manu H | CC BY-SA 4.0 |
