Pasadena (California): NASA's top scientists admitted to sleepless nights, sweaty palms, stomach aches and moments of pure terror as their $993 million Mars Insight spacecraft approaches a high-drama finale Monday: landing on Mars.
Mars Insight's goal is listen for quakes and tremors as a way to unveil the Red Planet's inner mysteries, how it formed billions of years ago, and by extension, how other rocky planets like Earth took shape.
The unmanned spacecraft launched nearly seven months ago, and is NASA's first to attempt to touch down on Earth's neighboring planet since the Curiosity rover arrived in 2012. More than half of 43 attempts to reach Mars with rovers, orbiters and probes by space agencies from around the world have failed.
NASA is the only space agency to have made it, and is invested in these robotic missions as a way to prepare for the first Mars-bound human explorers in the 2030s, according to AFP.
"We never take Mars for granted. Mars is hard," said Thomas Zurbuchen, NASA associate administrator for the science mission directorate, on Sunday.
The high drama of the entry, descent and landing phase begins at 11:47 am (1940 GMT) at NASA's Jet Propulsion Laboratory in Pasadena, California, home to mission control for Mars Insight. A carefully orchestrated sequence -- already fully preprogrammed on board the spacecraft -- takes place over the next several minutes, coined "six and a half minutes of terror."
Speeding faster than a bullet at 12,300 mph (19,800 kph), the heat-shielded spacecraft encounters scorching frictions as it enters Mars' atmosphere.
The heat shield soars to a temperature of 2,700 Fahrenheit (about 1,500 Celsius). Radio signals may be briefly lost. The heat shield is discarded, the three landing legs deploy, and the parachute pops out.
"We freefall for just a little bit, which is an absolutely terrifying thought for me," said Tom Hoffman, project manager of InSight.
But then, the spacecraft's thrusters begin to fire, further slowing down the 800-pound (365 kilogram) spacecraft to a speed of just about 5 mph (8 kph) when it reaches the surface. Since there is no joystick back on Earth for this spacecraft, and no way to intervene if anything goes wrong, Hoffman described his emotions as mixed.
"I am completely comfortable and completely nervous at the same time. We have done everything we can think to make sure we are going to be successful, but you just never know what is going to happen", he said.
Hoffman, who is father to a two-and-four-year-old, added that he has "not been sleeping that great," though he said that might because of his rambunctious toddlers.
But when the first signal arrives at 2001 GMT, hopefully showing that the lander set itself down, intact and upright, "I am totally going to unleash my inner four-year-old at that point," he said.
InSight will hit the Martian atmosphere a little before 3 p.m. EST (2000 GMT) while traveling about 12,300 mph (19,800 km/h). The spacecraft must nail its target entry angle of 12 degrees precisely, team members have said: Any steeper, and InSight will burn up; any shallower, and the vehicle will bounce off the atmosphere and careen into space.
InSight's landing will stream on NASA TV Public Channel, the agency's website, and social media channels. Beginning at 2:00 pm EST on November 26, there will be landing commentary on the NASA TV Public Channel. That runs until 3:30 pm. Just under the video, you can click the "Media" tab to instead watch "an uninterrupted clean feed of cameras" positioned inside the JPL mission control.
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