I have serious doubts that this actually happened
Perseverance Rover lands on Mars [video]
201–210 of 517 posts
Re: Perseverance Rover lands on Mars [video]
#202Any JPL/NASA HN users that could comment? That would be beyond awesome! Great job, mission!
JPL Engineer here, any questions I could convey to the slack I'll be glad to feed back to HN
Awesome achievement! What was the part of the mission you were most concerned about / most likely to go wrong?
Re: Perseverance Rover lands on Mars [video]
#203Earlier quoted context omitted.
N00b question: why is it black & white?
Other posters have pointed out that it's the hazard avoidance camera, but they haven't said why the hazard avoidance camera is black and white. When you do computer vision, the first step you do is convert your color image into a black and white image, and run your CV algorithms on the black and white image. This is because when you're looking at objects and shapes and stuff, it's contrast that tells you where the bo…
Thank you for the explanation. That was highly interesting. Does anyone else know if the human eye does perceive color directly? Is this at all technically possible? And if yes, why aren't we doing it with cameras?
Re: Perseverance Rover lands on Mars [video]
#204Earlier quoted context omitted.
.
Neither Perseverence or SpaceX landings involve latency for control commands, they are automated/preprogrammed in the vehicle and do not rely on real-time commands from the ground.
No one have said otherwise. The point still stands that landing on earth is not in the same universe as landing on Mars. Comparing is stupid.
Re: Perseverance Rover lands on Mars [video]
#205Any JPL/NASA HN users that could comment? That would be beyond awesome! Great job, mission!
JPL Engineer here, any questions I could convey to the slack I'll be glad to feed back to HN
Awesome stuff.
I couldn't help but wonder, while I watched the feed: What are the people in mission control doing during the landing?
Obviously they're monitoring telemetry - but what else? Presumably the time delay precludes them triggering anything critical manually, and making post-launch software changes would be frowned upon?
Re: Perseverance Rover lands on Mars [video]
#206Earlier quoted context omitted.
It's from a hazard camera, which is not used for main photography. Better images will come soon.
Worth noting that these first pictures are sent in the first seconds after touchdown, you can even still see the dust in the air from the landing (even if it was craned down to reduce dust). It also explains the very low resolution in general, they want to get confirmation ASAP, no time for high quality high resolution images.
The low resolution and fuzz is also because they still have the lens caps on - they are of course transparent lens caps in case the explosive bolts that will release them fail. Redundancy!
Re: Perseverance Rover lands on Mars [video]
#207This is so awesome. Go Nasa! I am amazed at what humans have been able to achieve in short time since the Industrial revolution. After all the negativity of last few months, this brings so much hope. Waiting for the first human foot touch down on Mars in my lifetime.
The pandemic has, in many ways, accelerated advancement and technological development.
All hail the shining twin gods, Advancement and Progress.
Re: Perseverance Rover lands on Mars [video]
#208Earlier quoted context omitted.
We actually got a picture like 3 minutes after landing. (Okay, a picture from shortly after landing.)
If I understood the livestream correctly, it's because they were able to (maintain|quickly establish) lock to the MRO after touch-down and zip a couple of images up through the "bent-pipe" UHF-to-high-power relay into the Deep Space Network.
It would seem they had MRO in position to snap a few photos of the landing / descent as well as do the relay.
Re: Perseverance Rover lands on Mars [video]
#209Any JPL/NASA HN users that could comment? That would be beyond awesome! Great job, mission!
JPL Engineer here, any questions I could convey to the slack I'll be glad to feed back to HN
"Slack" is actually the answer to one of the questions I was going to ask, about internal communication!
Hmm, another: Given that it's roughly a decade since MSL Curiosity, what were y'all (Perseverance team members) doing when Curiosity launched and landed? How many of today's team were in school back then, or what's the generational turnover and overlap like?
What's everyone's "favorite" failed Mars mission that would've changed everything if it'd succeeded?
Re: Perseverance Rover lands on Mars [video]
#210Earlier quoted context omitted.
> Also, remind me, did NASA develop reusable rockets? I can't tell if this is sarcasm or not but... yes, of course NASA developed reusable rockets. The space shuttle missions reused the shuttles and the boosters.
The Space Shuttle was reusable (with massive refurbishing after each flight) but given that'd it cost significantly more than a non-reusable rocket per pound I think the point stands. SpaceX managed to make a financially viable reusable rocket.
They really didn't. SpaceX is not cheaper than the shuttle no matter how many times it gets repeated. That SpaceX fudges the numbers so it is hard to compare doesn't make it true. In reality SpaceX is more expensive than not only the shuttle but also their own projections.
Here's a breakdown: https://youtu.be/4TxkE_oYrjU