Discover and read the best of Twitter Threads about #MarsPerseverance

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(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
Dear Earthlings: Thanks to NASA’s ingenuity and cool public outreach, the names of my family will arrive on the red planet Mars tonight.
The Perseverance rover onboard Atlas V-541 rocket 🚀 launched by NASA July 31, 2020 will land on Jezero crater, Mars tonight.
Mission:
To search for alien life
Attempt the first flight ever of a helicopter on another planet
It will also carry the names of 10,932,295 people who submitted their names to NASA through the ‘Send your name to Mars’ campaign, stenciled on a chip on a placard on the rover.
It’s NASA’s way of engaging the public and instilling interest in younger generations to inspire and expand their horizons of what is possible, and prepare the next generation carrying the mantle of space exploration
Read 7 tweets
Touchdown!!’

“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

pscp.tv/w/cv11hDFsWkVw…
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
(Thread) Shall we talk a bit about #MarsPerseverance 's EDL sequence? Let's start with the parachute. The design is called a disk-gap-band parachute. Picture below is from Tutt, Lowry, 2019. As you can see, there is a disk of fabric, a gap and a band of fabric. Hence the name!
It's a design already proven on the Viking Mars probes. However, there have been some changes to the original design.
To clarify, a "gore" is a segment of fabric that runs from the center to the rim, shaped somewhat like this:
Read 19 tweets
The traces of ancient valleys and river channels suggest liquid water once flowed across the surface of Mars. Today, the water is mostly locked up in the planet’s ice caps or buried underground.
But some of it is vaporizing, in the form of hydrogen leaking from the atmosphere, according to the new research co-authored in the journal Science Advances by two scientists at Britain’s Open University.
They detected the vapor by analyzing light passing through the Martian atmosphere using an instrument called the Nadir and Occultation for Mars Discovery.#MarsPerseverance
Read 6 tweets

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