All language subtitles for Mark.Robers.CrunchLabs.S02E07.My.Experience.Building.the.Mars.Rover.1080p.NF.WEB-DL.AAC2.0.H.264-WhiteHat_track3_[eng]

If you look behind me,
you'll see the center of the universe.

It's called the center of the universe

because that's NASA's
Jet Propulsion Laboratory.

All of the orbiters,
probes, and spacecraft

we've sent out
into the solar system and beyond

send all their signals
right back here to be processed.

That will never be more apparent
than in a few days

when the next Mars rover, Perseverance,

concludes its seven-month journey
to our neighboring red planet, Mars.

Autonomously navigating itself
for a terrifying seven minutes,

traveling from 15 times
the speed of a bullet

to a gentle
three-miles-per-hour touchdown,

while live-streaming the key data
the whole way.

As many of you know,
for me, this is like coming home.

Long before I started
making YouTube videos,

I came here to work
every day for nine years,

seven of which were working on
the last rover we sent to Mars, Curiosity.

Today, we're gonna talk
to some of my old friends

and see the actual rover up close

as I bring you up to speed
on everything about this rover landing.

Once you have an overview
of what's gonna happen

and what it took to get us to this point,

I feel certain
you're gonna feel just as pumped

about this historic landing as I am.

We're gonna talk about

the who, what, why,
where, and how of this rover.

We'll start with the why
and the where we're going.

3.5 billion years ago,
Earth and Mars were pretty similar.

Both had liquid water on the surface

and both were protected from the sun's
radiation with magnetic fields.

So it begs the question, if life
first developed on Earth at that time,

could it have also developed on Mars?

This is a massive lake in Jezero Crater
billions of years ago.

And this is it now.

This is where Perseverance is landing.

The bottom of an ancient lake
the size of Lake Tahoe.

Using Earth as a guide,
at the base of a river of fresh water

is where we have the best chance

of finding evidence
of past biological life on Mars.

Thanks to Perseverance,
we could be on the verge

of the monumental first discovery
of actual life outside our planet.

Being able to pinpoint
a landing spot this tight

shows how NASA
is constantly advancing its technologies.

With Florida for scale,

here's an oval showing
the uncertainty of the landing spot

for previous missions Pathfinder in 1997,

and then Phoenix in 2008,
Curiosity in 2012,

and now Perseverance.

Being able to shrink a landing target
gives you more options of places to land.

Plus, once you do land and start driving
towards the actual science location,

it could shave off a year or more
of drive time.

Not only does studying Mars help us
understand Earth's past and future,

but the rovers are advance scouts,

taking data and notes for us on the ground
and sending all the info back to Earth.

They're also testing new technologies
that humans will need to use

when we're exploring the planet ourselves
in the very near future.

Because the first person
to set foot on Mars is alive right now.

And it could be you.

And if you're like, "But, Mark,

why would we spend resources and time
exploring the solar system

when we have big issues here on Earth
we haven't solved?"

I tackle that question,

giving five reasons we can't afford
not to invest in space

in another video
you can watch after this one.

So that's the where and the why.

Let's talk about
how we're going to do that.

This is where it gets really wild.

Meet Perseverance.

I should mention, I have my monthly videos
planned out about a year in advance,

which is why exactly this time last year,

I knew I needed to fly down
to check out the rover

before it got shipped off to Florida
to be launched.

Before I checked out the rover,

I stopped in to see Ben,
who was my old boss.

He was leading a small team

that designed the jetpack
that lowered the rover to the ground.

Now I heard he's all fancy,
in charge of 400 people.

I wanted to get a sense
of how things had changed for him.

So anyone we see walk by,
you can, like, boss them around?

This guy? You can boss him around?

-Yeah, I can boss him around.
-Okay, cool. Go on.

We first geeked out for a bit
over parts from previous space missions.

A hardware wall like this
is a great illustration

of what makes JPL
such a cool place to work.

Actually, I designed this.

This is my hardware from GRAIL with Andy.

This was cool 'cause you got
these flexures for temperature variation.

This isn't just for show.

When you're figuring out
a way to do things,

these are examples
of how it's been done before.

A lot are examples
of the way you shouldn't do it.

-That's why my--
-That's why your hardware's up there.

[Mark] We headed down to check out
the rover and meet my friend Emily,

but before we could see it,
we had to get suited up

because the rover
is looking for signs of biological life.

We don't wanna contaminate our samples
before we even arrive.

So a bunny suit and air shower
can go a long way.

Emily was the vehicle-assembly lead
for the descent and cruise stages,

which is a big responsibility.

This is the rover.

[Emily] The flight rover.
It will be on Mars 12 months from now.

[Mark] It's so complex
when you come up and get this close.

Perseverance is the most complex thing

humans have ever built
and sent to another planet.

It's got laser, X-ray,
and radar capabilities,

plus 19 cameras and a nuclear-powered
battery system for energy.

While it might look similar
to the past rover, Curiosity,

the science instruments are different
because the objectives have changed.

The most notable difference is

the drill isn't there just to create
rock dust to study on the rover.

Perseverance has a hollow drill bit

to core out a chunk of rock
the size of a piece of chalk

and then package it up
and leave behind 43 separate samples

for a future mission to collect
and send back to Earth.

That way, we could study the samples
for those past signs of life

using state-of-the-art instruments
that we could never fit on a rover.

To capture that chalk-size rock sample,

not only is there an arm on the outside,
but there's one on the inside too.

[woman] It is a miniature robot arm
inside the body of the rover

that manipulates the sample tube.

-There's one right here.
-Wow.

-So is this what you leave behind?
-Exactly.

-This is, like, the poop of the rover?
-Exactly. [chuckles]

Okay. Do you like that analogy?
They didn't like it earlier.

-Yeah.
-You like it? Okay, cool.

We like to say
the rover's gonna poop out samples.

Okay, good. See? That's a good analogy.

Perseverance is only the first leg
of returning a piece of Mars to Earth.

Future missions will complete what I call
the "poop, scoop, and shoot" maneuver.

This is my friend Liz.

She's in charge of testing
for the sample-retrieval system.

We're doing things that nobody else does,
so we have to test it.

[Mark] She tests different configurations

in a chamber that recreates
the extreme temperatures and pressures

to make sure it will function on Mars.

'Cause once you send something to space,
it's gone, and you can't exactly fix it.

So it just has to work,

which is why testing
is such a big deal here at JPL.

My buddy Matt mentioned
another way this is done.

We build two spacecraft.
One goes to Mars. One we keep to test.

This is an exact replica of Curiosity,
who's driving around on Mars right now.

We use this one to test
driving around obstacles and over rocks.

[Mark] And he knows
about driving over rocks

because he was a rover driver
for both Opportunity and Curiosity.

This guy is one of
maybe 40 people in the world

who has driven a vehicle
on another planet,

which is kind of a big deal.

More cool things about Perseverance.

It has a mini helicopter drone

stowed away on its underbelly
named Ingenuity.

This will be mankind's
first powered flight on another planet,

which makes this a Wright brothers moment.

The rover and drone will get great
footage, but we're mainly testing it out

so that in the future, we might use drones
to scout out terrain for us

or get samples
from hard to reach locations,

or you could have swarms of drones
carrying materials for humans.

Perseverance is also testing
a new instrument called MOXIE

that basically amounts
to a mechanical tree

because its function
is to convert CO2 into oxygen,

which future explorers will need
to breathe and for rocket fuel.

[Emily] The rover's been
in this clean room for a year and a half,

starting as just a chassis,
just the skeleton.

[Mark] All the teams and engineers
have been taking turns

building up their part until it's done.

I was in that position on Curiosity,

designing my hardware
for three and a half years,

and when it was all tested and complete,

integrating it on the rover
here in this room.

For the other three and a half years,

I was working on a small team of engineers
on the jetpack descent stage.

We've covered where and why we're going.

Also, the how we're gonna do that
with the rover.

Now let's talk about the what.

What's gonna happen when it lands
and what you should expect to see.

As I edit this video,
the spacecraft is gliding toward Mars

at a cool 48,144 miles per hour.

How fast is that? It's this fast.

It's 15 times faster than a bullet.

It's traveling 100 soccer fields
in exactly this long.

It will keep on that trajectory
until the big moment

when it starts its entry, descent,
and landing, or EDL.

It's also known
as the Seven Minutes of Terror

because we've got seven minutes

to get from the top of the atmosphere
to the surface of Mars,

going from 13,000 miles per hour to zero
in perfect sequence and perfect timing,

and the spacecraft has to do it on its own
with no help from us on Earth.

When it hits the upper atmosphere,

friction causes the heat shield to start
glowing like the surface of the sun.

All the while, thrusters are firing

to steer and adjust its course
towards the target location.

And that aerobraking
gets rid of 99% of the energy,

so for the last 1%,
we deploy a supersonic parachute.

Then we pop off
the heat shield we no longer need

so the radar can start viewing the ground.

But even with the parachute,
it's traveling 200 miles per hour,

which is way too fast to land.

So we cut loose of the backshell
and fire the rockets.

We can't land in this configuration

because the rockets will kick up debris
and damage the rover.

So we lower it from a 21-foot rope
and gently land the rover on the surface

as my sky crane zooms off
to face an honorable, catastrophic ending

as far away from the rover
as its fuel will carry it.

So in just seven minutes, the spacecraft
has completely metamorphosized,

shedding all its sacrificial elements

until you're left with just a rover,
sitting alone,

safely on the surface of Mars.

Everything you just saw
was a CGI animation,

but a few days after landing,

we'll all be blown away
by actual HD landing footage

from the 23 cameras
and two microphones on board.

We'll see the parachute inflate
and hear the crunch of the wheels

as they touch down
and make contact with the Martian surface.

And because Mars is so far away,

to get a signal from the vehicle
to our planet,

it takes about 12 minutes
at the speed of light.

That means after the spacecraft
sends a signal

that it's reached the atmosphere,

by the time that signal reaches Earth
to kick off the Seven Minutes of Terror,

for at least five minutes,

the vehicle has actually
already been on the surface,

either alive or dead.

Which is why it has to be autonomous.

That means it makes its own choices
on the timing of things and where to steer

without anyone controlling it,

which means all we can do
is watch and monitor and hope.

And as easy as these dedicated teams
of engineers make it look,

landing on Mars is really hard.

Historically, only about half the attempts
have been successful,

but the willingness to take big risks
to reap big rewards

is the foundation on which NASA is built.

The livestream to watch the landing
starts on Thursday, February 18th

at 11:15 a.m. Pacific.

It will hit the top of the atmosphere
an hour and a half later at 12:48 p.m.,

which starts the Seven Minutes of Terror,
and we touch down at 12:55.

I'll leave a link in the video description
as well as some other really cool sites,

such as this video-game-like demo
where you can interactively experience

the Seven Minutes of Terror
in preparation for landing.

We covered where and why we're going,
we covered the how with the rover,

and the what with the landing details.

Now it's time for the who.

The human side to sending robot explorers
to other planets.

What makes NASA and JPL great aren't its
robots. It's the people who build them.

While it's not possible

for me to capture what it's gonna
feel like for them to see it land,

I can show you
what it felt like for me eight years ago

when I was in a similar situation.

I made a video when Curiosity landed,

but at the time, my channel
had less than 100,000 subscribers,

so I know most of you haven't seen this.

Even if you have,
with landing less than a week away,

it's a great time for a second watch
to get you pumped up.

For context, you should know
that during my time working on the rover,

I had a son and lost my mom to ALS.

While my contribution was small
relative to the overall picture,

I tried to capture the human element here

of what it feels like to have
seven years of your life and career

vindicated with that beautiful phrase,

"Touchdown confirmed.
We are safe on Mars."

So consider this my tribute
to everyone out there

working to push the limits
of human understanding,

with a little bit of help
from adorable little young Mark Rober.

[gentle music plays]

We're still two days from landing,

but you can see the news media
has already started to descend on JPL.

Since we're all nerds here,
our office pools look different.

This is, uh,
the landing ellipse for the rover,

and we all place guesses on where
we think it's gonna come down.

[man] Heading for the target.

Cruise stage separation.

[man] We have seen heating of the heat
shield through the MEDLI instrument.

Dynamics, Phase. Come back again with, uh…

[man] Parachute deployed.

[tense music plays]

We are in powered flight.
Standing by for sky crane.

Sky crane has started.

-Touchdown confirmed. We're safe on Mars.
-[cheering]

That's touchdown!

Whoa!

Woo-hoo!

[gentle music continues playing]

[music fades]