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NASA’s Mars Rover Landing: When to Watch

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February 18, 2021
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NASA’s newest robotic explorer will attain Mars on Thursday afternoon, the third spacecraft to reach on the planet this month after guests from the United Arab Emirates and China. The Perseverance rover is headed to Jezero Crater, a spot that planetary scientists assume might be a really perfect place to search out preserved indicators of life from a number of billion years in the past, if life ever did come up on Mars.

But first, NASA’s mission has to land in a single piece.

When is the touchdown and the way can I observe it?

Touchdown is predicted round 3:55 p.m. Eastern time. NASA Television will start broadcasting protection from the mission’s management room on the Jet Propulsion Laboratory in California at 2:15 p.m.

During the descent, the spacecraft will ship updates on how it’s doing. Because its predominant antenna won’t be pointing at Earth, its direct communications will simply be a sequence of easy tones.

“We can use those tones to tell us different things, like the heat shield has come off or something like that,” Allen Chen, the lead engineer for the touchdown a part of the mission, mentioned throughout a information convention on Wednesday.

It is feasible that Perseverance will ship again some images from the floor via NASA’s Mars Reconnaissance Orbiter, however they may take hours to reach. “If we get that, that’s golden,” mentioned Jennifer Trosper, a deputy challenge supervisor for the mission.

Why is touchdown on Mars so tough?

In a nutshell, Perseverance must decelerate from greater than 12,000 miles per hour to a full cease throughout what NASA calls “seven minutes of terror,” for the time frame from the rover’s entry into the ambiance till its touchdown. There isn’t any likelihood for a do-over. The path of Perseverance will intersect with the floor of Mars. The solely query is whether or not the rover will find yourself in a single piece, prepared to start its mission, or smashed into many items.

The skinny ambiance of Mars provides a number of ranges of problem. A spacecraft wants a warmth protect, as a result of friction from the air molecules heats its backside aspect to 1000’s of levels. But there’s not sufficient friction to sluggish it down for a mild touchdown with simply parachutes.

What will occur through the touchdown try?

The spacecraft must deal with the touchdown operation all by itself. It takes 11 minutes for a radio sign to journey from Mars to Earth. That means if something had been to go unsuitable, it could already be too late by the point individuals in NASA’s mission operations heart bought phrase.

“It all has to happen autonomously,” mentioned Matt Wallace, a deputy challenge supervisor. “Perseverance really has to fight her way down to the surface on her own. It’s something like a controlled disassembly of the spacecraft.”

About 80 seconds after getting into the ambiance, the spacecraft experiences peak temperatures, with the warmth protect on the underside of the capsule reaching 2,370 levels Fahrenheit. Inside the capsule, it’s quite a bit much less toasty — about room temperature. As the air turns into denser, the spacecraft continues to sluggish.

Small thrusters on the highest of the capsule hearth to tweak the angle and path of its descent and maintain it on the right track towards its touchdown website.

At an altitude of about seven miles, 4 minutes after entry into the ambiance, the capsule is touring at a pace underneath 1,000 miles per hour. It then deploys an enormous parachute, greater than 70 ft in diameter.

The spacecraft now drops the warmth protect, permitting cameras and different devices to pay attention to the terrain beneath to find out its place.

Even with the massive parachute, the spacecraft continues to be falling at about 200 miles per hour.

The subsequent essential step is named the sky crane maneuver. The prime of the capsule, known as the backshell, is let go and is carried away by the parachute. There are two items of the spacecraft left. The prime is the descent stage — in essence a rocket-powered jetpack carrying the rover beneath it. The engines of the descent stage hearth, first steering to keep away from a collision with the backshell and the parachute. Then the engines sluggish the descent to lower than two miles per hour.

About 66 ft above the floor, the rover is then lowered on cables. The descent stage continues downward till the wheels of the rover hit the bottom. Then the cables are minimize, and the descent stage flies away to crash at a protected distance from the rover.

What are the possibilities that it will work?

It has labored as soon as already. The Curiosity rover, which is at present on Mars, efficiently used the identical touchdown system in 2012. But spacecraft are difficult methods, and one success doesn’t assure a second success.

Perseverance has stronger parachutes and a extra exact navigation system. NASA engineers say they’ve tried to take every step to improve the chances that everything will work, however they have no idea if they’ve found out each contingency.

“We’ve never really come up with a good way of calculating the probability of success,” mentioned Mr. Wallace, the deputy challenge supervisor.

Over the a long time, NASA has succeeded in eight of 9 touchdown makes an attempt on Mars. The solely failure was the Mars Polar Lander in 1999.

Steve Jurcyzk, the appearing NASA administrator, acknowledged in an interview, “I will be extremely nervous.”

What will the rover do on Mars?

Over the previous 20 years, NASA has regularly requested extra complicated questions on Mars. First, the mantra was “Follow the water,” as that’s the place there as soon as could have been life. With big canyons, winding river channels and indicators of dried-up lakes, it has been clear that previously, water has flowed on Mars despite the fact that the planet is chilly and dry at present.

Perseverance’s vacation spot is Jezero Crater. The rover will discover the delta of a river that after flowed right into a lake that crammed the crater. The piles of sediments are a promising place the place the fossil chemical signatures of historical Martian microbes would possibly nonetheless be preserved at present.

The rover is basically the identical design because the Curiosity rover, which is now finding out the Gale Crater. But it’s carrying a unique set of devices, together with subtle cameras, lasers that may analyze the chemical make-up of rocks and ground-penetrating radar. Tests of these tools on Earth demonstrated the probabilities of discovering preserved indicators of previous life.

What about that “Marscopter?”

NASA’s new rover is carrying a four-pound helicopter called Ingenuity that may try one thing that has by no means been executed earlier than: the primary managed flight on one other world in our photo voltaic system.

Flying on Mars shouldn’t be a trivial endeavor. There shouldn’t be a lot air there to push towards to generate carry. At the floor of Mars, the ambiance is simply 1/100th as dense as Earth’s. The lesser gravity — one-third of what you’re feeling right here — helps with getting airborne. But taking off from the floor of Mars is the equal of flying via air as skinny as what can be discovered at an altitude of 100,000 ft on Earth. No terrestrial helicopter has ever flown that prime, and that’s greater than twice the altitude that jetliners sometimes fly at.

NASA’s engineers used a sequence of supplies and laptop expertise developments to beat a lot of these challenges. About two months after touchdown, Perseverance will drop off the helicopter from its stomach, and Ingenuity will try a sequence of about 5 take a look at flights of accelerating period.

If the checks succeed, it might pave the best way for future, bigger Marscopters. Having the choice of utilizing robotic fliers might drastically develop an area company’s potential to check the Martian panorama in additional element, simply because the transition from stationary landers to rovers did in earlier a long time.



Image /Information Credits

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