Discover and read the best of Twitter Threads about #perseverance

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NASA just released some interesting preliminary data from their instrumentation onboard the #Mars2020 lander that delivered #Perseverance

Here’s a quick thread w some thoughts

[TLDR: Mars entry is HOT, but we made the heat shield too big (again)]

So to start, let’s turn back the clock to 2012. While you were watching The Walking Dead and the London Olympics, the good folks at NASA were measuring the aerothermal environment of Mars entry for the Mars Science Laboratory (MSL Curiosity) mission
They did this with an instrumentation suite called “MEDLI” which stands for Mars Entry, Descent, & Landing Instrumentation

This contained, among other things, a bunch of heat transfer, pressure, and temperature measurement devices in and around the MSL heat shield
Read 13 tweets
#FunFact Aujourd'hui, le rover #Perseverance a photographié les cibles de calibration de l'instrument @SHERLOC2020 avec la caméra WATSON, située au bout du bras. Et il s'y cache quelques easter eggs que je vous invite à découvrir dans ce fil ! 🧐 (1/..)…
Les 5 cibles du haut sont des lames minces de minéraux, les 5 cibles du bas des échantillons de tissus utilisés dans les combinaisons des astronautes.
Cette photo est une mosaïque de 3 photos, cliquez sur ce lien puis sur la loupe pour zoomer. (2/..)…
Les minéraux utilisés pour les lames minces sont des silicates, la 2e lame est par exemple un quartz.
Au centre se trouve une lame mince de météorite martienne ! La 2e photo est un zoom sur ce morceau de Mars qui a retrouvé sa planète d'origine. (3/..)…
Read 8 tweets
- SALT Story -

“I don’t know whether to be happy or sad that my story is not unusual. If I just say that I was born to a farmer in a Solapur village, you will get the drift. My mother was very young and used to everything that comes with being a mother of five girls." (1/10)
"As the eldest, I grew up determined to be the son. Fortunately, I was good at Math. I saved myself from early marriage by getting into an engineering college on merit. My sisters were very happy." (2/10)

#realstory #Finance #womenpower
"Not because I was going to study, but because they could now share the scooty that I used to ride to school!

I am like a mother to my sisters because I do not want them to go through what I did." (3/10)

#money #education #scooty #MOTHER
Read 11 tweets
Cette photo de la planète Mars vous est offerte par la source d'#énergie la plus fiable de l'univers 🌌🙂

La #NASA a publié les premières photos panoramiques haute définition du rover #Perseverance ➡️…
🧵⬇️ Image
En plus des détails incroyables des reliefs du cratère #Jezero et de la poussière déposée dans un ancien delta, on peut apercevoir sur ce cliché le générateur thermoélectrique à radioisotopes de Perseverance ⚛️ (le cylindre à ailettes radiales).
Pour alimenter le rover en électricité dans les situations les plus extrêmes, la NASA utilise un #MMRTG (Multi-mission Radioisotope Thermoelectric Generator) au plutonium 238.
Read 7 tweets
NASA is set to hold a briefing in just 5 minutes on Perseverance's post-landing operations and to unveil the entry, descent, and landing imagery captured for the first time ever.


Watch live:
Thomas Zurbuchen, assoc. admin, SMD, HQ
Michael Watkins, dir., JPL
Matt Wallace, Perseverance deputy project manager, JPL
Al Chen, EDL lead, JPL
Dave Gruel, EDL camera lead, JPL
Justin Maki, Perseverance imaging scientist and instrument operations team chief, JPL
Jessica Samuels, surface mission mgr., JPL
Ken Williford, Perseverance deputy project scientist, JPL
Read 107 tweets
A chi si sta sorprendendo della bellissima storia marziana di #Perseverance, atterrata proprio ieri, come se fosse un evento epocale, senza nulla togliere alla sua ragguardevole tonnellata di tecnologia vorrei sommessamente ricordare qui...

Mars Pathfinder (1997), atterrato rimbalzando su cuscini che poi saranno usati su tutte le automobili terrestri con il nome di airbag.

Missione durata poco meno di due mesi...

Spirit, esserino ammartato nel 2004, finito in una tempesta di sabbia nel 2010 e lasciato definitivamente al suo destino dalla NASA nel 2011.

Read 7 tweets

Check out these images of #PerseveranceRover being dropped from the sky crane (left) and descent with chutes deployed via Mars Reconnaissance Orbiter! Incredible photos!

#Mars2020 #Perseverance #NASAPerseverance #NASA #Mars ImageImage
Folks, we just snapped of a photo of a spacecraft landing (possibly still at supersonic speed) on ANOTHER PLANET from a satellite also orbiting that planet. That is WILD

#NASAPerseverance #NASA #PerseveranceRover #Perseverance #Mars2020 #ScienceTwitter Image
I just can’t believe this image—am I right that we’re seeing some of the dust plume from the retro rockets? This is like a baroque painting Image
Read 5 tweets
So as I suspected I would be exhausted today, being an industrious sort of fellow, I had prepared some tweets ahead of time if #Perseverance hadn't worked........ but with a little tweaking, still relevant #countdowntomars

As everyone who follows space knows, there is a narrow line between success and failure - and there but for the grace of…
As many of you know, the British tend to celebrate failures and heroic ones at that.....…
Read 30 tweets
Morning everyone. Sleep well? No, was way too stoked up with adrenaline from last night's excitement, so today will probably be tweeting less as I keep falling asleep!
Here in Cheshire Cat Control, the landing was enlivened by a “RIMU” confirmation at the entry interface - “Rascal Imminent Madness Unfolds” thanks to Treacle who decided to see what all the fuss was about
Said rascality only stopped when there was an intervention and my wife decided to remove him so I could actually see what was happening at JPL
Read 12 tweets
(Thread) Continuing down the EDL sequence of #Mars2020 #MarsPerseverance, how was the Skycrane phase prepared? Obviously, it worked on @MarsCuriosity , was there anything to improve? Apparently, yes. @ATAEngineering performed studies with @MSCSoftware ADAMS to simulate the phase.
To simulate the event, a technique called multibody simulation is used (ADAMS is a software dedicated to that). Basically it's a physics simulator to perform analyses in time-domain. That's jargon for "it's a sandbox for engineers".
Because we cannot know in advance what the exact conditions for the landing will be, engineers resort to "Monte Carlo simulation". That's jargon for "we are running thousands of calculations with changes on the initial assumptions to cover all cases".
Read 4 tweets
Upcoming: The #Perseverance Post-Landing briefing.

We'll be covering and live-tweeting it in the thread below.
#CountdownToMars #Mars2020
You can listen in here, on NASA TV's media channel.
Read 84 tweets

“Commencing countdown, engines on...
Check ignition and may God's love be with you” #CountdownToMars  👇#Mars #Mars2020  #MarsPerseverance #BREAKING
Incredible! The first image from @NASAPersevere now safely touched down on #Mars! #MarsPerseverance #Mars2020  #Mars #NASASocial #NASAPersevere #NASA #Mars2020
Thanks to Swati “touchdown confirmed" Mohan for talking us through the @NASAPersevere #MarsLanding @DrSwatiMohan
#CountdownToMars  #mars2020 #Perseverance #WomenInScience #WomenInScienceDay
Read 4 tweets
NASA is LIVE with coverage of the Perseverance landing, happening around 2:55p US CT, this is the place to be

Percy about to hit the atmosphere at 3.5 miles/sec (5.5 km/s) and create some serious heat
#CountdownToMars #MarsPerseverance #Perseverance…
The extreme velocity of atmospheric entry will heat the surface of the heat shield to nearly 2,400 F (1,300 C) due to intense shock heating and aerodynamic forces
It’s a tricky part of the mission for many reasons, but our ability to predict/model the physics of these atmospheric entry events is currently limited—it’s a “multi-physics” problem which makes it tough even for our best super-computers to handle
Read 5 tweets
Ready for the #CountdownToMars? #Perseverance is set to begin its entry, descent, and Martian landing in just under 5 hours from now, at 12:55 p.m. PST (20:55 UTC). We'll be covering it here on Twitter.

What you need to know for today's #Mars landing:…
In order for today's landing to work successfully, the #Mars2020 mission needs to bleed off over 5,000 m/s of velocity within just four minutes, and conduct a rocket-powered crane descent. Here's today's descent timeline - also included in the article. #CountdownToMars
At 11:15 a.m. Pacific, NASA will start coverage of the landing on NASA TV, available globally. We'll be tweeting clips during our coverage, too.

Set a reminder for the launch stream:
Read 54 tweets
So ... more Mars everyone? Well you came to the right place.... @search_mars @howellspace @Thievesbook @NovelAudio

#Mars #CountdowntoMars #Perseverance

And I am going to tweet about some of the people we have spoken to - it's their day, not ours..... although....... ImageImageImageImage
@search_mars @howellspace @Thievesbook @NovelAudio For those of you waking up in the U.S., what a day it will be.

Yours truly appeared on a podcast with the always excellent @LibbyJackson__ and @AlexMartin

I have also done a piece about the work that scientists in Manchester have been doing on Martian - and other! - meteorites especially "Black Beauty" -- one of the more unusual in of the pieces of Mars which have fetched up here Image
Read 22 tweets
So on this day of days..... I will tweet some more prime Mars content..... and woke up to hear my own voice.....
So it is really the day!

#countdowntoMars #Mars #Space Image
So along with my fabulous co-author @howellspace, we have spent the last couple of years thinking of Mars - and our book @search_mars has the benefit of over thirty-five years of reporting - originally by me and now by Elizabeth
(who has been to Mars - well a simulated base) ImageImageImageImage
And she got to see #Perseverance and boy was in a sulk*

* only kidding. Between us both we have seen every Mars rover ever built at JPL and as you can see below I couldn't get away from Curiosity on my last trip to JPL ImageImageImageImage
Read 12 tweets
Jezero Crater, the future home of #Perseverance, is about 28 miles (45 km) across. There's an obvious river delta formation inside its western rim, and that's where the rover is going.
Here's a close-up of part of the fascinating landscape within the target #Perseverance landing and exploration area in Jezero, captured by the @HiRISE camera aboard NASA's MRO in July 2014. (Colored cropped and original map-projected monochrome versions.) ImageImage
FYI that ~800-meter-wide crater is named Belva.
Read 6 tweets
So .... a final sequence of tweets about the Mars missions which I reported on, how JPL got its Red Planet groove back on..... and a true story of why I should never navigate on Earth, let alone Mars..... #Mars @daretodream #Space #CountdownToMars Image
I started reporting on space for newspapers in 1989, in retrospect one of those pivotal years in history. By then, NASA had a number of problems: aging work force, end of the Cold War and what was the political point of the agency since the Soviets were no longer around Image
The politics were murky to say the least. In early 1992, The George H.W. Bush administration fired Dick Truly as the boss and brought in Dan Goldin, who, for all his fearsome reputation, had a problem he knew only too well was rushing towards him ImageImageImage
Read 20 tweets
By now, you've likely heard of this rover's mission, seen the hashtag #CountdownToMars, and may even be planning to pick up a red donut in its honor. Follow along as we chronicle the @NASAPersevere mission—and humanity's obsession with Mars—in the days ahead
Rover Name: Perseverance

Purpose: Collect rock and soil samples for possible return to Earth

Expected Landing: Feb. 18, 2021

Landing Site: Jezero Crater, Mars

Mission Duration: At least one Mars year (about 687 Earth days)
Scientists and engineers, working through the COVID-19 crisis on Earth, have prepared it for tasks ranging from trying to generate oxygen on Mars to searching for evidence of past life
Read 27 tweets
So another thread on..... Mars, this time the early years of the space age

#CountdowntoMars #Mars #Perseverance
1964 was a vintage year. The Beatles, Goldfinger, (consults notes – I was very young at the time), my christening and..... oh yes, JPL sent the first missions to the Red Planet @carolynporco
What people forget is that even then so very little was known about the Red Planet as it was not easy to see with then state-of-the art equipment – in that same year of 1964 the official USAF Cartography Center map of Mars still had canals drawn on it as ridiculous as it seems
Read 20 tweets
Have a freebie on us -…

I was a reporter when that story broke and cannot quite believe it is 25 years since it happened!
The story behind the story is even wilder - in one version, an escort ensconced in a fancy hotel with an official from the Clinton White House telephoned a supermarket tabloid and said life had been discovered - on Neptune
The debate became very heated, very vitriolic and now, today, it all hinges on experts who like arguing over the shape of crystals - but it was an object lesson in how NOT to announce life has been found on Mars. There have been other occasions!
Read 7 tweets
#CountdowntoMars Were it not for Covid, this week. Much of the world’s journalists, “space gypsies” and social media mavens would be descending on the von Kármán Auditorium at the Jet Propulsion Laboratory for the #Perseverance landing
Very few people today know who Theodor von Kármán was, why the press room is named after him, even though a great deal of history has taken place there – some of the most astounding about Mars
Very few people today know who Theodor von Kármán was, why the press room is named after him, even though a great deal of history has taken place there – some of the most astounding about Mars
Read 22 tweets
Dopo la separazione dello stadio di volo, ma prima dell'entrata in atmosfera saranno espulse 2 masse di tungsteno da 77 kg cad per dar modo al blocco contenente @NASAPersevere di cambiare il proprio centro di massa e generare portanza durante l'entrata in atmosfera.
La foto sopra è relativa all'EDL di Curiosity, perché la configurazione sarà simile (e non ho trovato l'infografica su Percy che mostra il momento dell'espulsione).
Nel 2014 NASA aveva indetto un concorso per rendere utili questi pesi morti anche dopo la loro espulsione.
Il concorso è stato vinto da una start-up texana che ha avuto l'idea di utilizzare questa massa per inserire un sistema di rilascio di tracciatori di gas (stronzio e bario) che avrebbero dato modo agli orbiter di rilevarli.
Non sappiamo se questa idea è stata portata avanti.
Read 7 tweets
Sta iniziando un seminario su @NASAPersevere di @aiaa al quale partecipa anche @torybruno.

Tory sta ricapitolando il lancio di #Perseverance, a bordo di Dominator (Atlas 541).
Loro sono i panelist di oggi.
Read 23 tweets

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