13 engineering truths proved by NASA's Curiosity Rover
Dubord is a member of the team that safely landed NASA’s Curiosity rover on the fourth planet from the sun, early on August 6, 2012, eastern time. Since then, it has been communicating with NASA's Mars Science Lab, passing valuable data and photos back to Earth.
In discussing the NASA Curiosity Rover's design, launch, successful landing, and continuing mission on Mars, Dubord touched on topics that, whether engineers want to accept or not, are real of all engineering, from simple consumer devices to complex spacecraft.
1. 'Fake it 'til you make it' doesn't apply to engineering.
"There are many things we can fake here on Earth. Gravity is one of the things we can't fake." – Dubord
In discussing the challenges of planning for Curiosity's successes, gravity was a key issue. Gravity on Mars is only a third of the gravity of Earth, and not something easily coordinated for.
Unlike other professions where you might be able to fudge a bit here and there to reach a goal, facts are facts and numbers are numbers in engineering.
2. Timing can be everything.
"We had to work with astrology—not astronomy, astrology. When was it all aligned and favorable to launch our spacecraft?" – Dubord, laughing a bit
NASA had a two week window, open only every two years, that offered favorable conditions for Curiosity's launch, travel, and landing. Kind of puts that tight deadline your manager set in perspective, eh?
3. Communication is key.
"Mars is really far away." – Dubord
Indeed, our neighboring planet is approximately 248,000,000 km at landing. Light at 2.99x108 m/s takes 14 minutes to travel that far. That delay means that if there was a problem on the rover, Earth wouldn't hear of it until 14 minutes after Curiosity registered it.
4. Safety first.
"During surface operations, the rover must react to unexpected results itself."– Dubord
With such a 14 minute delay, rovers need to be able to take care of themselves and priority was given to Curiosity's safety in landing. Its autonomous systems become vital to success. Entry to landing, itself, took 7 minutes and was over before NASA received the signal from Curiosity.
5. The best laid plans can still fail.
"As engineers, we think we know what the system can handle, but there are things we can't design around." – Dubord
If Mars' thin atmosphere, tricky gravity, low air pressure, and intense cold weren't enough to challenge design, an uneven landscape with a rocky terrain, wind, and other variables made Curiosity's landing even more difficult, impossible in some ways, to plan for.
6. You are going to fail sometimes.
"Only 50% of Mars landers have landed successfully." – Dubord
Sure, we know Spirit and Opportunity – still going strong beyond expected lifetimes – but what of the other many rovers that didn't touch down as their engineers had hoped? There have been other well-designed rovers, but 1 out of 2 hasn't landed successfully for various reasons. Sometimes even the best designs fail.
7. And sometimes there are no second chances.
"Software can be updated but hardware is fixed." – Dubord
While Curiosity was on its way to Mars, NASA noticed a software bug, which lead them to find other bugs. They could correct these issues with Curiosity on its way, but the hardware was done and out of their hands the second Curiosity left Earth.
All in all, NASA had 1 chance to get Curiosity to the surface of Mars without fail.