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NASA's Perseverance rover sends stunning images
351–360 of 365 posts
Re: NASA's Perseverance rover sends stunning images
#352Earlier quoted context omitted.
Right after landing, Perseverance put Ingenuity down on the ground and drove off to give some separation. The winds and sand aren't mechanically very strong - the Martian atmosphere isn't dense enough to transmit much force even at high wind speeds. The only real dangers are obscuring the sun (important because Ingenuity runs on solar power) and getting dust in all kinds of places. But the landing site is pretty low…
I don't think Perseverance moved since landing, and Ingenuity should be still inside the rover.
Ah - yup, was confusing the plan with something that had happened already. Apparently the rover will drive to a better takeoff site, then go through that process.
But the helicopter will, indeed, be expected to survive on its own, not even landing back near the river.
https://www.scientificamerican.com/article/the-first-100-day...
Re: NASA's Perseverance rover sends stunning images
#353Earlier quoted context omitted.
Economies of scale would surely change that though?
I was thinking it would be fun to buy some uranium 238 (you can have up to ~7kg of it without a license). Then I tried ddg'ing what it would cost to dispose of. I couldn't find an answer, so I decided buying uranium wasn't a good idea. It's hard enough getting rid of an old lead-cell battery.
I can't imagine people would like seeing enriched uranium. Sure it'd make a good story, but people don't even want to see my ore sample. Deleted uranium should also be fun; I'd love to have some dice made of it: https://www.orau.org/PTP/collection/consumer%20products/dudi...
Re: NASA's Perseverance rover sends stunning images
#354Hi
Re: NASA's Perseverance rover sends stunning images
#355Earlier quoted context omitted.
Galen Windsor and his colleagues worked elbow deep in plutonium and uranium for years. None of them ever got sick. There are some old Galen Windsor videos on YouTube. He traveled around the country eating uranium in front of his students and audience. The EPA of his day had hissy fits. Great stuff!
Eating unprocessed uranium order that isn't giving off very much radiation is a bit different. It just passes out of his body without bioaccumulating. Source for the claim he worked around plutonium "elbow deep" please.
If it was so harmless why was the government fining him and declaring his house a dangerous environmental disaster? This is a rhetorical question pointing out the non sequitur nature of your claim on bioaccumulation.
No source will be provided. You can do your own research instead of patronizing me with your assumptions. When I post a link to a source, I get hare brained responses as to why the reader refuses to open the link. If I don't post a link to the source, I get a request for the source. Either way I get gang stalked by NASA fan boiz maliciously flagging my comments. Every comment I have posted has been flagged. I already informed you there are old Galen Windsor videos and you know where to find them.
And I will say it one more time. Perseverance did not land on Mars. It's a cartoon.
Re: NASA's Perseverance rover sends stunning images
#356Earlier quoted context omitted.
10/10 satire
yeah, but as someone not educated in those matters, could someone compare the "fake" computations from the comment to real ones ? So we could see how wrong they are...
Simple division, density differential, Newton's law, and the square equation of fluid resistance, put the lie to this Hollywood rover landing.
When a object is descending in a fluid (gas or liquid) both Newton's law and the fluid drag differential law apply. The thinner the fluid, the more thrust is required to counteract Newton's law of remaining in motion. You would need an exponentially greater amount of thrust to slow a descent in a fluid 100x thinner. Imagine that the ocean is Earth's atmosphere, and a rocket enters the ocean, and is descending toward the bottom to land. Think about how much thrust is required to slow the descent. Now imagine Earth's atmosphere is the atmosphere of Mars. How much more thrust is required to slow the rockets descent, as compared to descent in water.
NASA says that earth's atmosphere is over 100x denser than the atmosphere of Mars. Remember the analogy of the required thrust in water versus required thrust in air, to halt descent. The differential between all three or any two of the three is enormous.
Really, that is all you need to prove that no way, no how did an landing module plummet at those speeds in a thin Martian atmosphere, with a tiny chute, then come to rest with a short rocket burst. Everything in the video is consistent with a descent and landing in Earth atmosphere, not Mars.
Adding to proof of the fraud is the audio clips. There is no human audible sound in atmosphere as thin as Mars. Human ears are designed for vibration in Earth air. The human audible vibrations cannot even cause molecules to pass the vibration in a 100x thinner atmosphere. The audio proves, if anything, that the events were recorded on earth.
Another evidence of fraud is NASA's claim of dust storms and lots of dust in the Mars atmosphere. With atmosphere 100x thinner than Earth's, the space between gas molecules cannot provide the buoyancy or ion concentration to hold and lift up all that dust. There should be virtually no dust in a super thin, Martian atmosphere.
50 years of predictive programming via sci fi movies has caused people to readily believe that screenplay is reality.
Question authority. It's always lying.
Re: NASA's Perseverance rover sends stunning images
#357Earlier quoted context omitted.
I have an opposite view of this. Cosmos and Mars, Sun whatever else was there long before us an will be still there long after us. From cosmic point of view humanity does not matter much. From that 1000ft view humans and whatever we built is natural and not different than colony of ants. We are just sand grains that will be crushed when next big asteroid comes by. Having pristine planet like Mars has no value besides…
What if in the future we could examine the contents of a particular rock from space? Have instruments sensitive enough to detect the remnants of Vogon breath from their visit millions of years ago? A pristine planet has value beyond 'I want this' IMO - it is an opportunity to perform experiments in an almost perfectly isolated test tube. As a human, I also find it beautiful. As you say though, this is an anthropocent…
Well but it is potential value, what if we never get such sensitive instruments?
I expect Mars to be big enough that when we will have such instruments there still be a lot of stuff not touched to use those on.
Re: NASA's Perseverance rover sends stunning images
#358Earlier quoted context omitted.
One of the most beautiful and haunting things I've ever heard was a tape cassette that had EM signals recorded by Voyager transposed into human-audible sound domain somehow. It was like whale song of space.
I found it here (there's a series on other planets/moons as well in the recommendations): https://www.youtube.com/watch?v=LIAZWb9_si4 And Cassini flying into Saturn https://www.youtube.com/watch?v=hWHLCHv4PiI I wonder what it sounds like to leave the atomosphere now too, I guess this is as close as we can get in the near future. Even with probes going 15km/s.
Ah yeah, that's the kind of thing! Cheers! The tape was recorded much earlier though (I was listening to it in the late 90's IIRC) and a lot longer.
Re: NASA's Perseverance rover sends stunning images
#359Earlier quoted context omitted.
They use the same kind of compression as the last mission. JP2, I believe. https://en.wikipedia.org/wiki/JPEG_2000 I'm not sure that data compression has progressed that much since Curiosity in 2012 or Insight in 2018. There have been some formats that have improved compression at the expense of large amounts of memory or processing power, but neither of those are abundant on a rad-hardened processor. Neither is elec…
I can't find references to JPEG 2000 on this report: https://link.springer.com/article/10.1007/s11214-020-00765-9 Are they being re-encoded into regular JPG files when being shown online?
You're right. They're encoding just regular JPEG for lossy compression. They're also using either ICER and LOCO for lossless compression. JP2 has been used for other Mars spacecraft (the HiRise orbiter, I believe), but the JPEG encoding was inherited from the Mars Insight lander (in 2018).
Re: NASA's Perseverance rover sends stunning images
#360Earlier quoted context omitted.
They use the same kind of compression as the last mission. JP2, I believe. https://en.wikipedia.org/wiki/JPEG_2000 I'm not sure that data compression has progressed that much since Curiosity in 2012 or Insight in 2018. There have been some formats that have improved compression at the expense of large amounts of memory or processing power, but neither of those are abundant on a rad-hardened processor. Neither is elec…
One of the obvious constraints is that for science reasons they transmit each image in a lossless format, so we're up against the limits of what a lossless image compressor can do. If there were a future mission's requirement to send back lossy images first, and CPU power was significant, something like AVIF or JPEG-XL would likely be a candidate. https://netflixtechblog.com/avif-for-next-generation-image-c... ICER a…
Found some more info. They're using ICER for lossless, like you say. They're also using LOCO for lossless compression. For lossy compression, the JPEG encoding was inherited from the Mars Insight lander (in 2018).
Page 36 from the PDF: https://link.springer.com/article/10.1007/s11214-020-00765-9