First surface photo is in too! https://i.imgur.com/C2s1job.jpg
NASA is making the raw images of everything available:
Perseverance Rover lands on Mars [video]
241–250 of 517 posts
Re: Perseverance Rover lands on Mars [video]
#242can't wait for the choppah
Re: Perseverance Rover lands on Mars [video]
#243Earlier quoted context omitted.
The world is a complicated place, Hobbes.[1] The lower "HazCams" hazard avoidance cameras (which captured those initial photos) are there to detect hazards (rocks, trenches, etc.). They are stereoscopic, lightweight, and high resolution. My guess is that using color sensors would have either increased the 3D mapping precision or added weight/power/bandwidth requirements, or otherwise been less robust in that environm…
> My guess is that using color sensors would have either increased the 3D mapping precision or added weight/power/bandwidth requirements, or otherwise been less robust in that environment. I think you meant to say decreased? In which case I think you would be correct! Camera pixels are made up of these things called photosites which don't by themselves record color, only brightness. In order to record color informati…
> I think you meant to say decreased?
I did, thank you. I think my brain had already skipped ahead to the added weight/complexity concept while my fingers were stuck on that part of the sentence.
I should probably read things after I type them...
Re: Perseverance Rover lands on Mars [video]
#244Earlier quoted context omitted.
N00b question: why is it black & white?
The world is a complicated place, Hobbes.[1] The lower "HazCams" hazard avoidance cameras (which captured those initial photos) are there to detect hazards (rocks, trenches, etc.). They are stereoscopic, lightweight, and high resolution. My guess is that using color sensors would have either increased the 3D mapping precision or added weight/power/bandwidth requirements, or otherwise been less robust in that environm…
And by "increased" I meant the "decreased" kind...
Re: Perseverance Rover lands on Mars [video]
#245Something I don't understand: when they say "X is 1 minute from happening", does that mean it's really 1 minute from happening or does that mean "in 1 minute we'll receive the signal that X has happened"? Maybe my question makes more sense in the case of "X is happening right now", because then I should either understand "we infer that X should have happened right about now" or "we have confirmed via signal that X ha…
Waiting for the physicist in the room to point out: there is no such thing as simultaneity! :)
Depends what type of physicist you ask.
According to the energy-time uncertainty principle we don't even know when exactly the RF waves that transmitted information hit the receiver on Earth either.
Re: Perseverance Rover lands on Mars [video]
#246These accomplishments are so damn inspiring. Reminds me of this West Wing clip: https://www.youtube.com/watch?v=R2HzHSeV9v8
Re: Perseverance Rover lands on Mars [video]
#247Earlier quoted context omitted.
The world is a complicated place, Hobbes.[1] The lower "HazCams" hazard avoidance cameras (which captured those initial photos) are there to detect hazards (rocks, trenches, etc.). They are stereoscopic, lightweight, and high resolution. My guess is that using color sensors would have either increased the 3D mapping precision or added weight/power/bandwidth requirements, or otherwise been less robust in that environm…
FYI - the HazCams on Perseverance are in fact in color (this is new, they were black and white on Curiosity)! Stereo precision was a concern based on the switch to color sensors, so there was some algorithmic work done to make sure it wouldn't cause an issue. (Source: https://link.springer.com/article/10.1007/s11214-020-00765-9 - "The Mars 2020 Navcams and Hazcams offer three primary improvements over MER and MSL. Th…
Interesting, I didn't know that. I knew the Cachecam was color, but somehow missed that detail, despite actually seeing the camera in person at one point...
Re: Perseverance Rover lands on Mars [video]
#248Watching the live feed was a blast. When they said they received the exact landing coordinates I was extremely curious to see it plotted vs their targeted landing zone, but unfortunately they haven't shown it yet. However, I could audibly hear an engineer in the background say "Oof, well, we'll take it!" Anyone seen anything about the precise location yet?
In one of the previous threads about Mars missions, one of the comments was how we have gotten to the ability of "land it close enough, and we'll drive the rest of the way". Seems pretty accurate for this mission.
Re: Perseverance Rover lands on Mars [video]
#249Earlier quoted context omitted.
Came here to suggest The Order of Time by C Rovelli, which explains this in such a captivating way.
I think this video explains the issue quite well in only two minutes: https://www.youtube.com/watch?v=wteiuxyqtoM
Another one here, it is in Catalan but with subtitles in english. Minute 18 is where it is explained although I think is worth it to watch all of it
https://www.ccma.cat/tv3/alacarta/quequicom/tempus-fugit-sub...
Re: Perseverance Rover lands on Mars [video]
#250I stopped watching videos like these when they started chanting like some crazy cult when things went well (USA! USA! USA!). No wonder we can't just get along.
I'm not american but still enjoyed the landing very much. They sent a freaking nuclear-powered jeep to the surface of another planet, they can gloat all they want.
I'm not saying anything bad about the landing. It was a great feat. I just find the chanting often done in US videos disgusting.