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Perseverance Rover lands on Mars [video]

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Re: Perseverance Rover lands on Mars [video]

#251

Post by lmilcin »

spaetzleesser wrote: post #236
tectonic wrote: post #14

You can also watch an EDL visualization in your browser: https://eyes.nasa.gov/apps/mars2020/#/home And read about how it will use Terrain Relative Navigation to find a safe landing spot: https://www.jpl.nasa.gov/news/a-neil-armstrong-for-mars-land... Perseverance is phenomenally complex, its Sample Caching System alone contains 3,000+ parts and two robotic arms. So exited for all the sciencing this nuclear-powered,…

They should make km the default unit and not miles....

Actually, NASA uses metric system internally. Imperial units are probably used for general public convenience.

Re: Perseverance Rover lands on Mars [video]

#252

Post by Daho0n »

tristanb wrote: post #227
Daho0n wrote: post #210

Earlier quoted context omitted.

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

you're wrong. That video is a bunch of crud

And I'm sure you believe that US and foreign competitors of SpaceX who says the same thing are just spewing PR, right? It was a random video. The message is not wrong. Being snippy doesn't change facts.

Re: Perseverance Rover lands on Mars [video]

#253

Post by jvanderbot »

jaegerpicker wrote: post #63
Azrael3000 wrote: post #55

It's a great achievement with some really interesting work done on the landing algorithms with terrain recognition and it seemed to have worked exceptionally well. Looking forward for the next landing in May of the Chinese rover and all the science these robots will produce. Also, the test of Ingenuity, the helicopter, will be very interesting to watch, that could really pave the way for a different exploration style…

Ingenuity is maybe the most interesting and coolest advance for space travel. The idea of a remote drone to explore Mars is just rad! I can totally nerd out about that!

You may be interested in dragonfly then: https://www.nasa.gov/dragonfly

Re: Perseverance Rover lands on Mars [video]

#255

Post by jvanderbot »

suyash wrote: post #148
jaegerpicker wrote: post #63

Earlier quoted context omitted.

Ingenuity is maybe the most interesting and coolest advance for space travel. The idea of a remote drone to explore Mars is just rad! I can totally nerd out about that!

More about Ingenuity https://spectrum.ieee.org/automaton/aerospace/robotic-explor... and it's source code https://github.com/nasa/fprime

That is not Ingenuity's source code, that's the software framework used to link the various software modules. It's generic to any mission / instrument.

Re: Perseverance Rover lands on Mars [video]

#256

Post by jamiek88 »

twic wrote: post #216
tectonic wrote: post #14

You can also watch an EDL visualization in your browser: https://eyes.nasa.gov/apps/mars2020/#/home And read about how it will use Terrain Relative Navigation to find a safe landing spot: https://www.jpl.nasa.gov/news/a-neil-armstrong-for-mars-land... Perseverance is phenomenally complex, its Sample Caching System alone contains 3,000+ parts and two robotic arms. So exited for all the sciencing this nuclear-powered,…

> Cruise Mass Balance Devices They put those in to make the probe seem higher-quality. They got the idea from Beats headphones.

Just to set the record a bit straighter and ruin your joke, those pics of beats with weights were knockoff beats from the flea market not real.

Re: Perseverance Rover lands on Mars [video]

#257

Post by Nekhrimah »

raylus wrote: post #152
notum wrote: post #58

Any 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

Any idea on the timeframe for unfurling the robotic arm? And doing the test drive?

Thanks for your efforts towards the fantastic result today.

Re: Perseverance Rover lands on Mars [video]

#258

Post by extropy »

Daho0n wrote: post #222
gfiorav wrote: post #197

Earlier quoted context omitted.

Waiting for the physicist in the room to point out: there is no such thing as simultaneity! :)

S/he already did. We just don't know yet.

She both did and did not until we observe :p.

And even that is not correct. Events happening propagate with speed of light - the event horizon. We can predict we will receive information of something happening, bit that's just prediction about future events, regardless of the location.

Re: Perseverance Rover lands on Mars [video]

#259

Post by azernik »

twic wrote: post #216
tectonic wrote: post #14

You can also watch an EDL visualization in your browser: https://eyes.nasa.gov/apps/mars2020/#/home And read about how it will use Terrain Relative Navigation to find a safe landing spot: https://www.jpl.nasa.gov/news/a-neil-armstrong-for-mars-land... Perseverance is phenomenally complex, its Sample Caching System alone contains 3,000+ parts and two robotic arms. So exited for all the sciencing this nuclear-powered,…

> Cruise Mass Balance Devices They put those in to make the probe seem higher-quality. They got the idea from Beats headphones.

We were doing that at Meraki back in the early 2010s (it turned out they were also useful as a heat sink and, because the metal was exposed to air, a radiator). Pretty sure Meraki got the idea from some Apple product or other.

Re: Perseverance Rover lands on Mars [video]

#260

Post by extropy »

colechristensen wrote: post #191
unanswered wrote: post #167

Something 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…

It looked like they were quoting time as it would appear for an earth-local observer (i.e. a million light-year away supernova that showed up five minutes ago happened "five minutes ago" not 1 million years and five minutes ago. With your personal light cone, it's fine to equate "now" with what you see in the moment. It just has to be clear what you mean for situations where communication might be ambiguous. If you h…

Relative time (in five minutes) without relativistic speeds is actually uniform. The is no observable difference to either participant.

And there is no concept of now in a significantly distant location. Related video: https://youtu.be/pTn6Ewhb27k

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