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8

The MAHLI camera of Curiosity may focus from infinity down to only 18.3 mm working distance. At minimal distance the resolution is 13.9 µm per pixel. It may image objects of some tens of meters in size down to only 22 by 17 mm. The Sherloc camera of the Mars 2020 Rover has a similar minimal object size of 23 by 15 mm. A microscope with a magnification of ...


8

The lubricant is a Braycote vacuum grease: Braycote 602-EF. There is good information on the Latching End Effector (LEE) lubrication task (the task that actually applies the grease to the Space Station Remote Manipulator System end effector mechanisms) in this paper: Extravehicular Activity Development of Unforeseen International Space Station Maintenance ...


6

In addition to the space weathering phenomenon described by ebv, optical surfaces can and do get dirtied by other mechanisms as well. In particular, outgassing from the rest of the spacecraft and produce various compounds that may recondense on lenses, especially if these surfaces are cooler than the rest of the spacecraft exterior, which they sometimes are ...


5

The winner (as of 2019) would be the ESA Herschel Space Observatory with a focal mirror of 3.5M/11.5ft (Image Source) Optical could include infrared, visible and ultraviolet, but not microwaves. Herschel covers both far infrared and microwaves (55–672 µm) and so doesn't show up on some lists of optical telescopes, but it counts as far as the current ...


4

Let's think about what stereo pictures give us scientifically rather than aesthetically. It's information about depth. How far something is away. Why scientifically? Because while bass players and astrophysicists like Brian May† can occasionally also be rich, they usually don't so many billions of dollars that they would need to count them on both hands to ...


3

I am not 100% sure but I think we are looking at the aperture cover. In the picture below I've pointed out what looks like hinges (top) and a latch (bottom). There's a cutaway of the scope here which does not show such a large obstruction. Source: https://dspace.mit.edu/bitstream/handle/1721.1/114747/Carlton%20Extended%20Abstract_Submitted_v2.pdf?sequence=...


2

There doesn't seem to be a lot of discussion of actual optical lenses because they are mainly used on spy satellites. This is because the large, compound telephoto camera lenses can produce diffraction-limited images over a wider field of view than their long focal length mirror based telescope cousins used to take pictures of the stars. For instance this ...


2

Even though the question has already been mostly answered, here is more information about current Lunar Ranging activities. The EUROLAS Data Center (EDC) of the Deutsches Geodätisches Forschungsinstitut at Technische Universität München has a nice website with an API to find laser ranging data. The data are the same than on the CDDIS website as the data ...


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