16:43
TEDxNASA

Joel Levine: Why we need to go back to Mars

Filmed:

In this talk, planetary scientist Joel Levine shows some intriguing -- and puzzling -- new discoveries about Mars: craters full of ice, traces of ancient oceans, and compelling hints at the presence, sometime in the past, of life. He makes the case for going back to Mars to find out more. (Filmed at TEDxNASA.)

- Planetary and atmospheric scientist
Joel Levine studies the atmospheres of Earth and Mars, looking at their origin, evolution, structure and chemistry and climate change. He's the principal investigator of the proposed ARES Mars Airplane Mission. Full bio

I want to talk about 4.6 billion years of history
00:15
in 18 minutes.
00:20
That's 300 million years per minute.
00:22
Let's start with the first photograph NASA obtained
00:25
of planet Mars.
00:29
This is fly-by, Mariner IV.
00:31
It was taken in 1965.
00:33
When this picture appeared,
00:36
that well-known scientific journal,
00:38
The New York Times, wrote in its editorial,
00:41
"Mars is uninteresting.
00:44
It's a dead world. NASA should not spend
00:46
any time or effort studying Mars anymore."
00:49
Fortunately, our leaders in Washington
00:53
at NASA headquarters knew better
00:55
and we began a very extensive study
00:57
of the red planet.
01:01
One of the key questions in all of science,
01:03
"Is there life outside of Earth?"
01:07
I believe that Mars is the most likely target
01:09
for life outside the Earth.
01:13
I'm going to show you in a few minutes
01:15
some amazing measurements that suggest
01:17
there may be life on Mars.
01:19
But let me start with a Viking photograph.
01:21
This is a composite taken by Viking in 1976.
01:25
Viking was developed and managed at the
01:29
NASA Langley Research Center.
01:32
We sent two orbiters and two landers in the summer of 1976.
01:34
We had four spacecraft, two around Mars,
01:38
two on the surface --
01:42
an amazing accomplishment.
01:44
This is the first photograph taken from
01:46
the surface of any planet.
01:48
This is a Viking Lander photograph
01:50
of the surface of Mars.
01:52
And yes, the red planet is red.
01:54
Mars is half the size of the Earth,
01:57
but because two-thirds of the Earth is covered by water,
02:00
the land area on Mars
02:03
is comparable to the land area on Earth.
02:06
So, Mars is a pretty big place even though it's half the size.
02:08
We have obtained topographic measurements
02:13
of the surface of Mars. We understand
02:16
the elevation differences.
02:18
We know a lot about Mars.
02:20
Mars has the largest volcano in the solar system,
02:22
Olympus Mons.
02:26
Mars has the Grand Canyon
02:28
of the solar system, Valles Marineris.
02:30
Very, very interesting planet.
02:33
Mars has the largest
02:35
impact crater in the solar system,
02:38
Hellas Basin.
02:40
This is 2,000 miles across.
02:42
If you happened to be on Mars
02:44
when this impactor hit,
02:46
it was a really bad day on Mars.
02:48
(Laughter)
02:50
This is Olympus Mons.
02:52
This is bigger than the state of Arizona.
02:54
Volcanoes are important, because volcanoes
02:57
produce atmospheres and they produce oceans.
02:59
We're looking at Valles Marineris,
03:02
the largest canyon in the solar system,
03:05
superimposed on a map of the United States,
03:07
3,000 miles across.
03:10
One of the most intriguing features about Mars,
03:12
the National Academy of Science says
03:15
one of the 10 major mysteries of the space age,
03:17
is why certain areas of Mars
03:20
are so highly magnetized.
03:23
We call this crustal magnetism.
03:25
There are regions on Mars, where, for some reason --
03:27
we don't understand why at this point --
03:30
the surface is very, very highly magnetized.
03:33
Is there water on Mars?
03:36
The answer is no, there is no liquid water
03:38
on the surface of Mars today.
03:41
But there is intriguing evidence
03:43
that suggests that the early history of Mars
03:45
there may have been rivers
03:48
and fast flowing water.
03:50
Today Mars is very very dry.
03:53
We believe there's some water in the polar caps,
03:55
there are polar caps of North Pole and South Pole.
03:58
Here are some recent images.
04:01
This is from Spirit and Opportunity.
04:03
These images that show at one time,
04:06
there was very fast flowing water on the surface of Mars.
04:08
Why is water important? Water is important
04:12
because if you want life you have to have water.
04:14
Water is the key ingredient
04:18
in the evolution, the origin of life on a planet.
04:20
Here is some picture of Antarctica
04:24
and a picture of Olympus Mons,
04:26
very similar features, glaciers.
04:29
So, this is frozen water.
04:31
This is ice water on Mars.
04:33
This is my favorite picture. This was just taken a few weeks ago.
04:36
It has not been seen publicly.
04:39
This is European space agency
04:41
Mars Express, image of a crater on Mars
04:44
and in the middle of the crater
04:46
we have liquid water, we have ice.
04:48
Very intriguing photograph.
04:51
We now believe that in the early history of Mars,
04:53
which is 4.6 billion years ago,
04:57
4.6 billion years ago, Mars was very Earth-like.
05:00
Mars had rivers, Mars had lakes,
05:04
but more important Mars had planetary-scale oceans.
05:07
We believe that the oceans were in the northern hemisphere,
05:11
and this area in blue,
05:15
which shows a depression of about four miles,
05:17
was the ancient ocean area
05:20
on the surface of Mars.
05:23
Where did the ocean's worth of water on Mars go?
05:25
Well, we have an idea.
05:28
This is a measurement we obtained a few years ago
05:30
from a Mars-orbiting satellite called Odyssey.
05:33
Sub-surface water on Mars,
05:37
frozen in the form of ice.
05:39
And this shows the percent. If it's a blueish color,
05:42
it means 16 percent by weight.
05:45
Sixteen percent, by weight, of the interior
05:48
contains frozen water, or ice.
05:50
So, there is a lot of water below the surface.
05:53
The most intriguing and puzzling measurement,
05:56
in my opinion, we've obtained of Mars,
06:00
was released earlier this year
06:03
in the magazine Science.
06:06
And what we're looking at is the presence of the gas methane,
06:09
CH4, in the atmosphere of Mars.
06:13
And you can see there are three distinct regions of methane.
06:17
Why is methane important?
06:21
Because on Earth, almost all --
06:23
99.9 percent -- of the methane
06:25
is produced by living systems,
06:28
not little green men, but microscopic life
06:31
below the surface or at the surface.
06:35
We now have evidence
06:37
that methane is in the atmosphere of Mars,
06:39
a gas that, on Earth,
06:42
is biogenic in origin,
06:44
produced by living systems.
06:46
These are the three plumes: A, B1, B2.
06:48
And this is the terrain it appears over,
06:52
and we know from geological studies
06:55
that these regions are the oldest regions on Mars.
06:58
In fact, the Earth and Mars
07:02
are both 4.6 billion years old.
07:04
The oldest rock on Earth is only 3.6 billion.
07:08
The reason there is a billion-year gap
07:12
in our geological understanding
07:15
is because of plate tectonics,
07:17
The crust of the Earth has been recycled.
07:19
We have no geological record prior
07:22
for the first billion years.
07:24
That record exists on Mars.
07:26
And this terrain that we're looking at
07:28
dates back to 4.6 billion years
07:30
when Earth and Mars were formed.
07:34
It was a Tuesday.
07:37
(Laughter)
07:39
This is a map that shows
07:41
where we've put our spacecraft on the surface of Mars.
07:43
Here is Viking I, Viking II.
07:47
This is Opportunity. This is Spirit.
07:50
This is Mars Pathfinder. This is Phoenix,
07:53
we just put two years ago.
07:55
Notice all of our rovers and all of our landers
07:57
have gone to the northern hemisphere.
08:01
That's because the northern hemisphere
08:03
is the region of the ancient
08:06
ocean basin.
08:08
There aren't many craters.
08:10
And that's because the water protected the basin
08:12
from being impacted by asteroids and meteorites.
08:15
But look in the southern hemisphere.
08:19
In the southern hemisphere there are impact craters,
08:22
there are volcanic craters.
08:24
Here's Hellas Basin,
08:26
a very very different place, geologically.
08:28
Look where the methane is, the methane is in a very
08:31
rough terrain area.
08:34
What is the best way to unravel
08:38
the mysteries on Mars that exist?
08:40
We asked this question 10 years ago.
08:43
We invited 10 of the top Mars scientists
08:47
to the Langley Research Center for two days.
08:50
We addressed on the board
08:54
the major questions that have not been answered.
08:56
And we spent two days deciding
08:59
how to best answer this question.
09:02
And the result of our meeting
09:05
was a robotic rocket-powered airplane we call ARES.
09:08
It's an Aerial Regional-scale Environmental Surveyor.
09:14
There's a model of ARES here.
09:18
This is a 20-percent scale model.
09:20
This airplane was designed at the Langley Research Center.
09:23
If any place in the world
09:27
can build an airplane to fly on Mars,
09:29
it's the Langley Research Center,
09:31
for almost 100 years
09:33
a leading center of aeronautics in the world.
09:35
We fly about a mile above the surface.
09:38
We cover hundreds of miles,
09:41
and we fly about 450 miles an hour.
09:43
We can do things that rovers can't do
09:46
and landers can't do:
09:49
We can fly above mountains, volcanoes, impact craters;
09:51
we fly over valleys;
09:54
we can fly over surface magnetism,
09:56
the polar caps, subsurface water;
09:58
and we can search for life on Mars.
10:01
But, of equal importance,
10:03
as we fly through the atmosphere of Mars,
10:05
we transmit that journey,
10:08
the first flight of an airplane outside of the Earth,
10:11
we transmit those images back to Earth.
10:14
And our goal is to inspire the American public
10:17
who is paying for this mission through tax dollars.
10:21
But more important we will
10:24
inspire the next generation of scientists,
10:27
technologists, engineers and mathematicians.
10:30
And that's a critical area of national security
10:33
and economic vitality, to make sure
10:37
we produce the next generation
10:41
of scientists, engineers, mathematicians and technologists.
10:43
This is what ARES looks like
10:46
as it flies over Mars.
10:49
We preprogram it.
10:51
We will fly where the methane is.
10:53
We will have instruments aboard the plane
10:55
that will sample, every three minutes, the atmosphere of Mars.
10:58
We will look for methane
11:01
as well as other gasses
11:03
produced by living systems.
11:05
We will pinpoint where these gases emanate from,
11:07
because we can measure the gradient where it comes from,
11:11
and there, we can direct the next mission
11:14
to land right in that area.
11:17
How do we transport an airplane to Mars?
11:20
In two words, very carefully.
11:23
The problem is we don't fly it to Mars,
11:26
we put it in a spacecraft
11:30
and we send it to Mars.
11:33
The problem is the spacecraft's
11:35
largest diameter is nine feet;
11:37
ARES is 21-foot wingspan, 17 feet long.
11:41
How do we get it to Mars?
11:46
We fold it,
11:48
and we transport it in a spacecraft.
11:50
And we have it in something called an aeroshell.
11:53
This is how we do it.
11:56
And we have a little video that describes the sequence.
11:58
Video: Seven, six. Green board. Five, four, three, two, one.
12:02
Main engine start, and liftoff.
12:07
Joel Levine: This is a launch from the Kennedy Space Center in Florida.
12:20
This is the spacecraft taking nine months
12:29
to get to Mars.
12:31
It enters the atmosphere of Mars.
12:33
A lot of heating,
12:36
frictional heating. It's going 18 thousand miles an hour.
12:41
A parachute opens up to slow it down.
12:43
The thermal tiles fall off.
12:47
The airplane is exposed to the atmosphere for the first time.
12:50
It unfolds.
12:53
The rocket engine begins.
12:56
We believe that in a one-hour flight
13:05
we can rewrite the textbook on Mars
13:08
by making high-resolution measurements of the atmosphere,
13:11
looking for gases of biogenic origin,
13:14
looking for gases of volcanic origin,
13:17
studying the surface, studying the magnetism
13:20
on the surface, which we don't understand,
13:23
as well as about a dozen other areas.
13:25
Practice makes perfect.
13:28
How do we know we can do it?
13:30
Because we have tested ARES model,
13:32
several models in a half a dozen wind tunnels
13:36
at the NASA Langley Research Center for eight years,
13:39
under Mars conditions.
13:42
And, of equal importance
13:44
is, we test ARES in the Earth's atmosphere,
13:46
at 100,000 feet,
13:50
which is comparable to the density and pressure
13:53
of the atmosphere on Mars where we'll fly.
13:56
Now, 100,000 feet, if you fly cross-country to Los Angeles,
13:59
you fly 37,000 feet.
14:02
We do our tests at 100,000 feet.
14:04
And I want to show you one of our tests.
14:07
This is a half-scale model.
14:10
This is a high-altitude helium balloon.
14:12
This is over Tilamook, Oregon.
14:14
We put the folded airplane on the balloon --
14:17
it took about three hours to get up there --
14:21
and then we released it on command
14:23
at 103,000 feet,
14:25
and we deploy the airplane and everything works perfectly.
14:27
And we've done
14:31
high-altitude and low-altitude tests,
14:33
just to perfect this technique.
14:35
We're ready to go.
14:40
I have a scale model here.
14:42
But we have a full-scale model
14:44
in storage at the NASA Langley Research Center.
14:46
We're ready to go. All we need is a check from NASA headquarters
14:49
(Laughter)
14:53
to cover the costs.
14:55
I'm prepared to donate my honorarium for today's talk
14:57
for this mission.
15:00
There's actually no honorarium for anyone for this thing.
15:02
This is the ARES team;
15:06
we have about 150 scientists, engineers;
15:08
where we're working with Jet Propulsion Laboratory,
15:12
Goddard Space Flight Center,
15:14
Ames Research Center and half a dozen major universities
15:16
and corporations in developing this.
15:19
It's a large effort. It's all at NASA Langley Research Center.
15:21
And let me conclude by saying
15:28
not too far from here,
15:31
right down the road in Kittyhawk, North Carolina,
15:33
a little more than 100 years ago
15:36
history was made
15:38
when we had the first powered flight of an airplane on Earth.
15:40
We are on the verge right now
15:43
to make the first flight of an airplane
15:45
outside the Earth's atmosphere.
15:48
We are prepared to fly this on Mars,
15:50
rewrite the textbook about Mars.
15:53
If you're interested in more information,
15:55
we have a website that describes this exciting
15:58
and intriguing mission, and why we want to do it.
16:01
Thank you very much.
16:04
(Applause)
16:06

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About the Speaker:

Joel Levine - Planetary and atmospheric scientist
Joel Levine studies the atmospheres of Earth and Mars, looking at their origin, evolution, structure and chemistry and climate change. He's the principal investigator of the proposed ARES Mars Airplane Mission.

Why you should listen

Joel S. Levine is a senior research scientist in the Science Mission Directorate at NASA's Langley Research Center, and the principal investigator and chief scientist of the proposed ARES Mars Airplane Mission. ARES (Aerial Regional-scale Environmental Survey) is a robotic, rocket-powered Mars airplane designed to investigate the atmosphere, surface and sub-surface of Mars.

In his research, he studies the atmospheres of Earth and Mars, tracking their development and changes: How similar are they? What can Earth learn from Mars?

His work as an atmospheric scientist had an interesting sideline, as he wrote in this Q&A for students:  

From 1998 to 2001, at the request of the National Archives and Records Administration in Washington, D.C., I formed and led a team of NASA scientists to solve the mystery of why tiny white spots were forming in the hermetically sealed encasements containing the Declaration of Independence, the U.S. Constitution and the Bill of Rights. Using noninvasive techniques that were originally developed to measure trace gases in Earth's atmosphere, we solved the problem. We measured very high concentrations of water vapor in the hermetically sealed encasements. The high concentrations of water vapor chemically reacted with the glass encasements, causing the leaching out of alkaline material from the glass, resulting in the formation of the mysterious white spots. The situation was corrected in 2001, when personnel at the National Archives and Records Administration removed the documents from the original encasements, put them in brand-new encasements and put them back on display at the National Archives. This was a unique opportunity to apply NASA-developed technology to solve a non-aerospace problem of great national interest and concern -- the preservation of the founding documents of the United States of America! 

More profile about the speaker
Joel Levine | Speaker | TED.com