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Chandrayaan-3 Soft-landing [video]

isro.gov.in

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Re: Chandrayaan-3 Soft-landing [video]

#211

Post by ismayilzadan »

sriku wrote: post #209
sva_ wrote: post #201

Earlier quoted context omitted.

I can imagine that this is a HN-bubble thing. Most people would probably get bored from just seeing some live footage.

Nope. Same reaction from a wide variety of people including my wife who's not in tech and doesn't know what HN or YCombinator are. She was like "let the team speak already!"

You wife probably a highly educated person sharing similar views in life like you

Re: Chandrayaan-3 Soft-landing [video]

#212

Post by shubhamkrm »

factorialboy wrote: post #136
shri_krishna wrote: post #128

Earlier quoted context omitted.

> Why such a long political speech ISRO is primary arm of the Department of Space which is headed by the Prime Minister. So in essence, the Prime Minister is the boss. It is not an independent federal agency like NASA.

If my understanding is correct, did the PM in his speech promise to fund a future mission to Saturn?

IIRC, he mentioned missions to the Sun, Venus and a manned space mission.

Re: Chandrayaan-3 Soft-landing [video]

#215

Post by sph »

The_Colonel wrote: post #28
jvm___ wrote: post #12

Scott Manly has a video on why he thinks the last one failed. It sounds like their landing software didn't have "oh crap, we're way off course, just land wherever". It only had the happy path of "fly to here and land", so when it switched to the landing phase it tried valiently (including flying upside down) to try to fly back to the landing zone, but the landing zone was much further than fuel supplies allowed. Hope…

Not considering such a basic error condition seems like a gross omission. This can't even come from the software engineering, but must be some kind of managerial failure (e.g. we're short on time, but have to report great progress to my boss, so skip this scenario).

This is the software engineering version of "I am very badass", passing judgement on software at the cutting edge of science, while sitting at home writing React code.

Re: Chandrayaan-3 Soft-landing [video]

#216

Post by mrtksn »

confuseddesi wrote: post #75

It’s landed! Congratulations to India on this great achievement!

One of the most populous countries has become a strong contender in space exploration. Hopefully, it will inspire so many more Indians to push it further and elevate the humanity, just like USA and USSR once did. It's great.

Re: Chandrayaan-3 Soft-landing [video]

#220

Post by extraduder_ire »

raverbashing wrote: post #17
jvm___ wrote: post #12

Scott Manly has a video on why he thinks the last one failed. It sounds like their landing software didn't have "oh crap, we're way off course, just land wherever". It only had the happy path of "fly to here and land", so when it switched to the landing phase it tried valiently (including flying upside down) to try to fly back to the landing zone, but the landing zone was much further than fuel supplies allowed. Hope…

This applies to general software development but is especially true in this case While we think "this cannot ever happen" in a lot of cases it can, in ways you did not consider. Both for good and bad

The recent japanese lander had something like this happen a while back. The altitude radar noticed a sudden 2km drop in ground-level, and the system assumed it was broken and stopped using that data.

Turns out it just flew over a cliff edge that actually does that. Completely by accident.

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