From the pages of WIRED, more or less unfortunately.
This week, scientists are dropping an Olympus Mons of findings from the two brave robots. In three papers published today in the journal Science—each authored by dozens of scientists from around the world—researchers detail the clever ways they used InSight’s seismometer to peer deep into the Red Planet, giving them an unprecedented understanding of its crust, mantle, and core. It’s the first time scientists have mapped the interior of a planet other than Earth. And yesterday, another group of scientists held a press conference to announce early research results from Perseverance, and the next steps the rover will take to explore the surface of Jezero Crater, once a lake that could have been home to ancient microbial life.
Of course, it is the marsotectonic stuff we are all interested in.
The researchers reckon that the crust is made of two or three layers. There’s a topmost layer that’s 10 kilometers thick, which InSight’s measurements revealed to be unexpectedly light, perhaps because it’s made of fractured rock left over from meteorite impacts. The layer below that goes down to about 20 kilometers. “Unfortunately, we are not sure what follows next, if it’s already the mantle or if we have a third layer in the crust. There’s some ambiguities that we haven’t resolved,” says Knapmeyer-Endrun. “We can definitely say that the crust is not as thick as has been predicted previously, and it has a lower density.”
Planetary seismologist Simon Stähler of ETH Zürich led the effort to characterize the hottest and innermost chunk of Mars’ interior—its core. Though they lack the ability to actually see inside the planetary center, Stähler’s team was able to extract some information just by analyzing the S-waves that bounce off the core-mantle boundary. These rumblings, unable to penetrate the liquid core, find their way back up to the Martian surface, where they are picked up by InSight’s receivers. “It takes a good 10 minutes,” Stähler says, from the time of the quake to the detection of the signal reflected by the core. By measuring this interval, his team was able to deduce how deep into the planet the waves are traveling, thus measuring the depth of the core itself: around 1,550 kilometers from the surface.
And,
Previous estimates of the core’s radius using geochemical and geophysical data hinted at the absence of a lower mantle, but scientists needed InSight’s seismological readings to confirm it. Without this layer, the Martian core likely cooled much more readily than Earth’s. This is key to understanding the evolution of the Red Planet, and in particular why it lost its magnetic field, a barrier that would have protected the atmosphere—and potential life—from harsh solar winds. Creating a magnetic field requires a temperature gradient between the outer and inner core, high enough to create circulating currents that churn the core’s liquid and give rise to a magnetic field. But the core cooled so fast that these convection currents died out.
So, terraforming begins with a core? This may be harder than the Mars Society thinks!
(Score: 0, Funny) by Anonymous Coward on Saturday July 24 2021, @07:21PM (1 child)
Yes, so bring some kindling and dig a very deep pit. We're gonna have a big long luau..
(Score: 0) by Anonymous Coward on Saturday July 24 2021, @07:56PM
If it's poi all the way down, where does the magnetic field come from?
(Score: 3, Interesting) by looorg on Saturday July 24 2021, @08:46PM
Wallace and Gromit will be quite disappointed, I would have thought they would have expected it to be cheese again.
(Score: 0) by Anonymous Coward on Saturday July 24 2021, @09:01PM (3 children)
Turns out it's mostly rocks
(Score: 0) by Anonymous Coward on Sunday July 25 2021, @04:29AM (2 children)
I'm bored with Mars. Past missions have been fantastic, no question. But they're to the point of diminishing returns. Just what is yet another lander/rover/copter supposed to find? Okay, maybe one more mission to one of the poles, that might be different somehow.
There are other planets. Yeah, they're harder to reach, and it made great sense to do Mars first, but we've done Mars. Figure out how to put a lander on Venus that'll last more than a few minutes, that'd be an accomplishment. Put a rover on the dark side of Mercury. Drill down to the supposed underground oceans on Enceladus or Ganymede -- pop a mini-submarine down in one of those and that'll be worth talking about.
I don't think NASA is up to the challenge anymore. They have to worry about what color their employees are and which genitals they have this week; they don't have time to figure out how to push non-manned exploration to new heights.
Fuck Mars. Reading about what Voyager 2 is finding out about space beyond the heliosphere is more interesting than yet another picture of red rocks.
(Score: 2) by Eratosthenes on Sunday July 25 2021, @05:35AM
And yet, you barely understand Gaia! Do you really understand the Van Allen belts, or how ozone keeps your pasty whiteness from being scorched? So you understand the cycle of climate that makes the planet liveable for such lazy persons as youself? Of course you do not. But, you are bored with Mars. Let me tell you about the Moon . . .
(Score: 0) by Anonymous Coward on Sunday July 25 2021, @08:27AM
> Just what is yet another lander/rover/copter supposed to find?
Then 2 sentence later opining about not sending a lander/rover/copter somewhere NEW and SHINNIAR than Mars.
(Score: 0) by Anonymous Coward on Saturday July 24 2021, @09:07PM
That's my gold, all mine.
(Score: 0, Redundant) by aristarchus on Monday July 26 2021, @10:36AM
The Greek word ἡπατοσκοπία refers to the ancient practice of trying to augur what the future might hold by examining the guts of animals, particularly sacrificial ones, after they were dispatched. Special attention was paid to the liver, what with spots and foie gras and whatnot.
May be Etruscuan in orgin, Wikipedia article here [wikipedia.org]. Not sure what practicing such on a God like Mars, or a Planet, would entail. God-sacrifice is more a Christian or Naskapi thing. But InSight has certainly given us more information than we had before, even though it is knowledge of the past rather than the future.
(Score: -1, Troll) by Anonymous Coward on Monday July 26 2021, @06:53PM
a big red turd?