NASA’s latest rover, Perseverance, on Thursday launched on an astrobiology mission to look for signs of ancient microbial life on Mars — and to fly a helicopter-drone on another world for the first time.
Previous trips to Mars have discovered it was far warmer and wetter 3 billion years ago than it is today, creating the conditions necessary for carbon-based life.
Perseverance’s goal is to go a step further and discover whether “habitable” translated to “habited.”
“There would be no bigger discovery in the history of humanity than finding life that is not on our own world,” NASA administrator Jim Bridenstine said. “If we were to make a discovery that it in fact was, everything from that point forward is going to be: ‘OK, what other life is out there? How do we get to it? How do we study it?’”
An Atlas V rocket carrying Perseverance’s spaceship took off on schedule at 7:50am from Cape Canaveral, Florida, and its stages separated according to plan, but as the spacecraft passed through the Earth’s shadow, the temperature of a heating system dropped, triggering a “safe mode” that switched off all but essential systems.
NASA said it had not encountered the problem before because previous spaceships followed a different flight path, but added that the issue was not serious and the vessel would soon be back in normal mode.
“The philosophy is that it is far better to trigger a safe mode event when not required, than miss one that is,” it said.
If all goes to plan, Perseverance would reach Mars on Feb. 18 next year, becoming the fifth rover to complete the voyage since 1997.
So far, all have been launched by the US. China launched its first Mars rover last week, which should arrive by May next year, when the planet could have three active rovers, including NASA’s Curiosity, which landed in 2012.
Perseverance is an improved version of Curiosity — faster, smarter and capable of autonomously navigating 200m per day.
About the size of a small sport utility vehicle, it weighs 1 tonne, has 19 cameras and two microphones — which scientists hope would be the first to record sound on Mars. It also has a 2m-long robotic arm and is powered by a small nuclear battery.
Once on the surface, NASA plans to deploy the Ingenuity Mars Helicopter — a small 1.8kg aircraft that is to attempt to fly in an atmosphere that is only 1 percent the density on Earth.
The idea is to lay down a proof of concept that could one day revolutionize planetary exploration, since rovers can only cover a few dozen kilometers in their whole lifespans, and are vulnerable to sand dunes and other obstacles.
Another goal is to help pave the way for human missions — and a major obstacle is the planet’s atmosphere of 96 percent carbon dioxide.
Liquid oxygen can be brought from Earth, or oxygen can be mined from ice underneath the surface. A simpler approach is converting it from the atmosphere, which is what the Mars Oxygen In-Situ Resource Utilization Experiment can do using a process called electrolysis.
The plan is to perform at least 10 oxygen-producing runs using the vehicle battery-sized device under as many different seasonal and environmental conditions as possible, but Perseverance’s primary mission is to scour the planet for evidence of ancient life forms.
The rover’s drill plans to collect about 30 intact rock cores and place them in test tubes, to be collected by a joint US-European mission.
Indisputable proof of past life on Mars would most likely not be confirmed, if it exists, until the samples are analyzed, which is unlikely to happen before the 2030s.
The mission is set to last at least two years, but probably much longer given the endurance previous rovers have shown.
Henry Tong (湯偉雄) and Elaine To (杜依蘭) were preparing to spend their first wedding anniversary in separate prison cells until their acquittal for rioting during Hong Kong’s pro-democracy protests. There were gasps and tears of relief in court on Friday last week as a judge declared prosecutors had failed to prove that the couple took part in clashes with police in July last year. The pair walked free in a ruling that has potential consequences for hundreds of other protesters facing similar charges. However, they have a long journey ahead as they try to rebuild their lives and business. “We have already been punished,”
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