The world’s most intimate view of a Mars landing begins about 230 seconds after the spacecraft entered the Red Planet’s upper atmosphere at 12,500 mph (20,100 kph). The video opens in black, with the camera lens still covered within the parachute compartment. Within less than a second, the spacecraft’s parachute deploys and transforms from a compressed 18-by-26 inch (46-by-66 centimeter) cylinder of nylon, Technora, and Kevlar into a fully inflated 70.5-foot-wide (21.5-meter-wide) canopy – the largest ever sent to Mars. The tens of thousands of pounds of force that the parachute generates in such a short period stresses both the parachute and the vehicle.I have a tremendous amount of respect for the people involved in designing and pulling off this mission so far; not just the JPL but I'm approaching "five nines" (99.999%) sure that established defense and space contractors who are experienced with designing for space did much of the heavy lifting. The levels of endurance, resilience, and reliability required in the electronics at every level is almost comical. This hardness is demanded from the components themselves, to the subsystems created, to the entire spacecraft and its auxiliary elements. The running joke is that all the components used in space, "Class S" components, aren't considered acceptable until the test documents weigh more than the launch vehicle. The testing should exhaust about half the components expected life (and they routinely work far longer than expected).
“Now we finally have a front-row view to what we call ‘the seven minutes of terror’ while landing on Mars,” said Michael Watkins, director of NASA’s Jet Propulsion Laboratory in Southern California, which manages the mission for the agency. “From the explosive opening of the parachute to the landing rockets’ plume sending dust and debris flying at touchdown, it’s absolutely awe-inspiring.”
I worked on one of those contracts for the JPL in the early '90s, and the JPL people exude an air of competence. JPL has a desire to plan for every eventuality and asked rather amazing and dumbfounding questions. Things like how a system might react when it was turned off if the systems it was connected with did something unexpected. Most of us think our circuits won't do anything when they're turned off, but it's a worth looking at if the tests can be done.
If you're keeping an eye on SpaceX Boca Chica, you'll know that the expected static firing of SN10 (Sten? Ted?) didn't happen today. They have road closures tomorrow and Wednesday and FAA clearances to go for repeat of SN8 and 9's flight potentially as early as this week, although I kind of doubt it. I don't know what went wrong today, but they didn't get as far as the cryo proof testing done in the last round of tests, judging by looking at the videos from late in the test. There are never signs of the vehicle venting or getting icy, so it never got fueled.