The NASA/ESA Mars Sample Return mission has been canceled (science.org)

207 points by Muhammad523 3 hours ago

peri-cl 2 hours ago

This article only obliquely mentions in the last paragraphs, but there's a parallel Chinese program that recently brought back samples from the moon, and will attempt Mars sample return, launching in 2028,

https://en.wikipedia.org/wiki/Tianwen-3

notabee 2 hours ago

Anyone wanting to be involved in the future of scientific research should probably start learning Mandarin. We're going the way of the Soviets, where political officers will quash any science that doesn't fit their ideology. https://arstechnica.com/science/2026/09/trump-planning-to-ha...

amarcheschi 2 hours ago

A few hours ago I was looking for some food safety information, found a US gov website posted on reddit and

The website wasn't available anymore

sellmesoap 38 minutes ago

drstewart an hour ago

walrus01 2 hours ago

autoexec 38 minutes ago

rayiner 12 minutes ago

What’s the relevance of your point to this article? The program is extremely over budget and taking money from other projects. The previous administration sent NASA back to the drawing board on the project as well: https://www.courthousenews.com/nasa-goes-back-to-drawing-boa...

> NASA needs to rethink its goal of returning samples from the Martian surface to Earth, the agency’s administrator Bill Nelson said in a press call on Monday.

gamblor956 2 hours ago

where political officers will quash any science that doesn't fit their ideology

China also does this. We just don't hear about it because they also quash the reporting.

throwaway27448 33 minutes ago

walrus01 2 hours ago

Gagarin1917 4 minutes ago

Fraterkes 2 hours ago

Do we really need to frame China’s succes here in terms of American decline? Do you think everyone outside the US views the moonlanding as a black page in history?

It’s fine to talk about a “race” if jingoism is the thing that gets most people on board with funding Nasa. But we ought to know better.

dragonwriter an hour ago

notahacker an hour ago

jfengel an hour ago

dclowd9901 an hour ago

lostlogin an hour ago

anamexis 2 hours ago

Dig1t an hour ago

Go check out the grants which were cancelled:

https://grantwitness.org/nsf

Download the CSV and search for things like "Latinx" or "Black" or "equity" or "URM" (URM = non-white)

>CHS: Large: Collaborative Research: Gender-Inclusive Open Source through Gender-Inclusive Tools

>This work will harness foundational gender research to provide theory-based yet practical solutions, towards addressing the underrepresentation of women in OSS communities.

>The AGEP Florida Alliance Model: Improving Minority Women Success in STEM Faculty Careers

>The research team is also investigating ways that URM women in STEM build skills, knowledge and competencies to successfully enter and persist in faculty careers.

>STEM Leadership, Equity, and Advancement for Faculty

>The NSF ADVANCE program is designed to foster gender equity through a focus on the identification and elimination of organizational barriers

Most of these are pure racism and absolutely deserved to be revoked.

sebzim4500 17 minutes ago

samudrijan an hour ago

drstewart 2 hours ago

At least we definitely know they shouldn't be learning German or French

ourmandave an hour ago

Jan 3rd is coming soon to an impeachment near you.

Steady as she goes, Mr. Sulu.

PaulDavisThe1st an hour ago

lukeify 2 hours ago

The NASA/ESA MSR was of substantially higher quality, mind you. The M2020 rover specifically picked up samples of high scientific value to be returned. The Chinese return mission will only return what it finds from its direct landing site.

ok_dad 2 hours ago

It would be cool if NASA worked with the Chinese agency to collect those cores using their rocket, it would be a win win.

duskwuff 2 hours ago

XorNot 2 hours ago

It's not like they're going to do it only once though, and some is a lot more then zero.

Muhammad523 2 hours ago

I think that the scientific community really doesn't care about who will bring the samples back, but simply wheter someone will do it and share them with the world

reaperducer 2 hours ago

it's just that NASA has given up on being the one to do it first.

No need to. Mars delivers:

https://www.nytimes.com/2026/09/20/arts/who-owns-this-chunk-...

jmclnx 2 hours ago

> it's rather that NASA has (?) given up on being the one to do it first

I think the Trump admin decided since it will not make them a profit, like other scientific research already canceled, it is not worth doing.

GolfPopper 2 hours ago

"Profit" is too generous a motive. It didn't service the Big Man's ego, so it's gone. That they can do some damage by killing it just makes it sweeter. Trump is Teemu Saruman.

titzer 2 hours ago

jumploops 2 hours ago

I worked on (a very small part of) the ExoMars rover (now called the Rosalind Franklin[0]).

It was supposed to launch in 2018, then was pushed to the early 2020s on a Russian rocket. For obvious reasons, it got pushed again, now launching in 2028.

The state of the world isn't great for space exploration, but I'm hopeful this mission will be revived at some point in the future.

[0]https://en.wikipedia.org/wiki/Rosalind_Franklin_(rover)

fireflymetavrse 2 hours ago

Beyond earth orbit launches actually is not that low [1]. MSR has a long history of revival and cancellation.

[1] https://spacestatsonline.com/launches/beo

Muhammad523 2 hours ago

I'm curious to know on which part you worked on, could you tell us?

jumploops an hour ago

Sure! I worked on the digital logic that connects the rover to one of the scientific instruments on board, specifically the Mars Organic Molecule Analyser[0].

[0]https://en.wikipedia.org/wiki/Mars_Organic_Molecule_Analyser

Muhammad523 an hour ago

Teever 2 hours ago

As an outsider who is very interested in space exploration I'm very flummoxed by the state of space exploration.

With the price of launches so low compared to only 20 years ago due to advancements in launch technology and the increased cadence of launches it seems like it should be easier to do these kinds of missions and that there should be more, cheaper missions that are willing to take risks because the per mission cost is so much lower.

Can you comment on why that doesn't seem to be happening? Why aren't we covering Mars in cheap rovers and satellites?

nancyminusone 2 hours ago

For both operating mars rovers, the launch vehicle cost was about 10% of the total. So even if the providers paid you to launch, you'll still be picking up 80% of the remainder. Cut the development cost by 10x? Still in the hundred million dollar range. So still only large goverments can afford. And none of them would approve a bunch of rovers, they'd just see a discount on the one rover they already don't want to give you - "you have one, isn't that enough? Why do you need two?"

odyssey7 33 minutes ago

ak6te an hour ago

The nature of science and exploration is that every mission is harder than the last, which is a reasonable first order proxy for expense. For NASA specifically, there has also been a large focus placed on making delivery to orbit and the moon a commercial service rather than something that NASA has to do in-house which has held us back.

And as others have said, there is really no such thing as a cheap rover. As a recent example, there was recently a push by NASA HQ to refurbish a Mars rover engineering unit (basically a one-to-one copy of the one sent to Mars, kept at JPL for use in ops planning and issue debugging) into an operational lunar rover. The estimated cost to take this existing piece of hardware and make it fully flight ready and suitable for the new mission was hundreds of millions of dollars.

nomel 2 hours ago

We've had 8 launches in the past 3 years, with only 10 in the combined 17 years before [1].

Seems that the reduced cost is being taken advantage of. And, make sure to exclude the drastic reduction in non-lunar launches in your cost comparison for lunar launches.

[1] https://en.wikipedia.org/wiki/List_of_missions_to_the_Moon#2...

giantrobot 2 hours ago

Some types of launches to some classes or orbits have gotten cheaper. Not all launches to all orbits. I don't know if any commercial launch services can even do planetary transfer orbits.

In space everything is an orbital change. To change orbits you need to speed up and slow down, all of that requires fuel. Even using what are known as "low energy" trajectories that use a bunch of gravitational slingshots need velocity changes to adjust trajectories to get the right angle of approach to some large body.

Most commercial launch services focus on LEO because the secondary stages don't need to carry much fuel and their engines only need to fire reliably once to get into a stable orbit.

A planetary transfer requires multiple engine firings. That's much harder than a single reliable firing. It's not impossible but the testing and engineering is expensive.

A science mission often needs to beg, borrow, and steal to get built. There's one shot to accomplish the mission objectives. That's more expensive engineering and testing. Some mission profiles require specific planetary alignments with very narrow launch windows to boot. So there's a lot of expensive work made more expensive by a tight deadline.

The actual marginal cost of the rocket, fuel, and launch is a very small part of the mission cost. Halving the launch price doesn't necessarily affect the cost of anything else.

Starlink satellites are effectively disposable. If a Falcon 9 explodes or fails to get the second stage to orbit they're out maybe a few tens of millions of dollars. If a science mission has some mission-killing failure there's no funding for a do-over.

LetsGetTechnicl 2 hours ago

Probably has something to do with the recent anti-science movement that currently has our country and government in a chokehold.

tinfoilhatter an hour ago

The cost of launches has come down, but not the cost of Freemason actors and CGI.

angelgonzales 35 minutes ago

This mission is representative of what JPL has become. Leadership there increased the cost of the program to $11B and would not bring the samples back until 2040, they also designed the mission around legacy rockets like Ariane 64 instead of working to lower costs and increase capacity by working with industry and designing around Starship or New Glenn. The moon missions brought back 842 pounds of rocks and MSL would bring back 1.1 pounds. It’s directionally better to wait for manned missions to Mars so we can bring back tons of rocks or even do the research on Mars itself. It seems like the JPL mission is maximized to provide jobs to researchers and maximized for mission complexity rather than just buying rocks from a contractor with quoted price and lead time.

I’d be interested in working there to help accelerate the program but I’m not if I would get support internally.

sertyrion 2 hours ago

That article is from January 6 2026. Not sure why it is being surfaced now.

Muhammad523 2 hours ago

I read it today and found it interesting, i was unaware of the fact that the mission had been canceled

zokier an hour ago

It was long dead even before this final cancellation.

notahacker an hour ago

lithobraking an hour ago

I'm personally sad to see samples from Jezero crater with potential biosignatures [1] won't find their way back to Earth for the foreseeable future. I was _really_ looking forward to learning more about what we found.

Maybe in some ideal world the US and China would work together to pass those samples on to a Chinese MSR, but it seems borderline impossible.

[1]: https://www.nature.com/articles/s41586-025-09413-0

Imnimo 2 hours ago

I never really understood why you'd have Perseverance drill the cores and then just leave them on the ground for an underdefined future mission to retrieve.

yabones 2 hours ago

An all-in-one solution would be far too heavy. Splitting the tasks up makes a lot of sense. Having all the equipment onboard to drill cores, quickly analyze them, decide if they're worth keeping, and then putting samples in containers is enough work for one rover.

* Storing all the samples onboard means a larger and heavier rover

* Mass budget squeeze means no more helicopter

* The return requires a ground launch from mars, so no more SkyCrane delivery system

kphorn an hour ago

They store the empty tubes, why not the full ones? Are they collecting that much mass that it’s really impractical. Are the empty tubes nested like solo cups to save space? I understand the rationale for the sample return, but those tubes will be hard to find after years of dust storms.

Muhammad523 2 hours ago

Perseverance, obivously, has onboard instruments to analize the samples before dumping them on the ground

smallerize an hour ago

No. The sample is only physically measured and then imaged. https://www.nasa.gov/centers-and-facilities/jpl/the-extraord... All further analysis will happen when the sample is returned to earth.

q_andrew 2 hours ago

Because the powers that be would have deemed a real plan as too expensive.

petcat 2 hours ago

> would have deemed a real plan as too expensive

Who are these "powers that be"? And do they have an infinite credit card? Could they really just do whatever they want and for some reason they choose not to?

psadauskas 2 hours ago

q_andrew 2 hours ago

Sharlin an hour ago

smallerize an hour ago

giantrobot 2 hours ago

mrguyorama an hour ago

nomel 2 hours ago

Or, it's simply cheaper to send the equipment to analyze the samples in the rover, than to send the samples back.

kphorn an hour ago

Agree, the decision to drop samples on the ground doesn’t make sense to me. Store them in the rover. Much easier to find them all in one spot later.

peri-cl 2 hours ago

trebligdivad 2 hours ago

The Japanese 'Martian Moons exploration' mission is launching to Phobos next month and doing a sample return; how hard would a martian to phobos sample moving mission be that could then be collected off Phobos sometime?

ortusdux 2 hours ago

I think the original plan was to land another rover, which would drive to each sample. I hope future plans weight the use of helicopters for retrieval after Ingenuity's success. It looks like the sample capsules weigh less than 3oz.

zokier an hour ago

Using helicopters was in the plan already, e.g. https://en.wikipedia.org/wiki/Mars_Sample_Recovery_Helicopte...

Aboutplants 2 hours ago

For better or worse it won’t be long until we get private exploration for minerals and water on the Moon and nearby planets, at a relatively decent scale (in comparative terms)

mrguyorama 41 minutes ago

What could possibly fund the private exploration of minerals or water on the Moon or planets?

Which of the 180ish elements would possibly be found on a foreign body in enough scale that couldn't possibly be found, made, or replaced by cheaper means here on earth?

Space mining doesn't make sense! We can't even justify exploiting all known resources here on earth itself because they aren't profitable, how do you work those numbers when, instead of literal slave labor, you have to pay the energy cost of going up and then back down for every kilo of matter?

If it's often not worth it to mine literal gold here on earth because it can't be profitably extracted, the core limit on gold mines as an investment and business venture, why would it be profitable to, for example, mine that gold on Mars and try to bring it home?

Muhammad523 2 hours ago

The James Webb Space Telescope had a $10 dollar price tag, why wasn't it considered too expensive at the time?

wmf 2 hours ago

Costs increased after it was already under construction so sunk costs kicked in. MSR was still in the planning stages when it was canceled.

NooneAtAll3 44 minutes ago

MSR was in planning stages *and already* had budget overruns big enough to cancel lunar rover

That cancelled program became famous for leaving behind an already bought launcher that now will fly mass simulator

CrankyBear an hour ago

This article is nine months old.

throw0101c 2 hours ago

Howtown had a video on this a few weeks ago:

* https://www.youtube.com/watch?v=zvCgC1yA7_w

ckemere an hour ago

Has anyone seen broader reporting on the rest of the science budget?

whalesalad 2 hours ago

My brother in law (JPL) was telling me about this earlier in August. Big letdown but he assured me that they'll come back to earth some day ... just gonna sit up there a long time.

ckemere an hour ago

Any news since January???

jmyeet an hour ago

I'm surprised nobody has mentioned this but one reason not to do this mission is that we have ~400 Martian samples from meteors found on Earth [1]. The fact that there's even 1 is kind of amazing to me. And this has been confirmed by multiple methods including analyzing the air bubbles trapped in the rock matching Mars's atmosphere.

Flying to Mars and then flying back is incredibly complicated and much more expensive. Rather than sending an exploratory rover or a satellite, you have to basically send an entire launch vehicle when we've never launched anything into orbit from Mars before. And it has to operate essentially autonomously (for the launch).

Even missions to get samples from comets and asteroids are far less complicated because you're not dropping into a gravity well with just enough atmosphere to cover all your stuff in dust but not enough for atmospheric braking. Mars has the exact wrong amount of atmosphere.

Obviously samples returned from Mars would be better but it diminishes the value when we already have samples here. So the huge price tag and incredible engineering complexity becomes harder to justify.

[1]: https://www.nhm.ac.uk/discover/martian-meteorites-rare-visit...

Waterluvian an hour ago

> we have ~400 Martian samples from meteors found on Earth

We have Mars rocks at home.

> Obviously samples returned from Mars would be better

The Mars rocks at home.

Muhammad523 33 minutes ago

The martian samples from meteors found on Earth aren't as good as the samples we'd get from a Mars Sample Return Mission because they have been in contact with stuff like water, air and who knows what else

ck2 an hour ago

don't boo, vote

I was holding my breath for Nancy Grace Roman Space Telescope which amazingly wasn't cancelled but they did cancel its successor, the Habitable Worlds Observatory Space Telescope which would be able to spot earth-sized exo-planets

even though Congress already funded it, because somehow the executive is allowed to illegally pocket veto Congress over and over again past two years

it's all Heritage Foundation and Russell Vought, he has no use for science and education

Simon_O_Rourke an hour ago

Fucking retarded, just take whatever was wasted fighting a losing was for no good reason and spend it on NASA.

mring33621 2 hours ago

My bet is that the new Trump-flavored NASA still wants to do this, but without the Europeans.

LorenDB 2 hours ago

Knowing Jared Isaacman, he won't let MSR die without a fight. It wouldn't shock me to see NASA consider Rocket Lab's MSR proposal; they had submitted a pretty affordable proposal some time ago.

bpodgursky 7 minutes ago

Isaacman definitely likes scientific missions but was skeptical of MSR, he thinks we will have a manned mission to Mars by the late 2030s so the payoff was not there given the extremely long timeline and high costs.

And I mean I agree, for that much money we should be doing missions to Europa instead.

wood_spirit 2 hours ago

Yes the administration warned American space companies not to attend the international space summit in France last week because it was international cooperation. NASA attended.

hackingonempty 2 hours ago

The USA can't afford to waste money shipping a bunch of rocks halfway across the Solar system just so some woke geeks can speculate if Mars in the past could have supported transgender athletes.

It would jeopardize important national security projects like the White House Ballroom, the Triumphal Arch, the Garden of Heroes and National Golf Course, and of course the Donald J. Trump Center for The Performing Arts (formerly The Memorial To That Loser That Got Assassinated.)

TedDoesntTalk 2 hours ago

Although I don’t agree with your phrasing, $11 billion to bring back some rocks when we have a $40+ trillion deficit makes no sense.

9dev 2 hours ago

Sure does. R&D investments have a massively larger RoI than military spending - and you won’t be paying off that debt by trying to be frugal. The only way is forward, and bombing schools in Iran isn’t that. It might not be Mars either, but at the very least some interesting science falls out of it, and perhaps some interesting products out of that.

KaiMagnus an hour ago

Kinda crazy that we could launch one mission like this daily for almost exactly ten years with that deficit.

Muhammad523 2 hours ago

I was reading this outraged until i realized you were being sarcastic, lol

MiloLeo 2 hours ago

After reading this comment I think it would be worth 11 billion dollars just to get you off this forum.

dpcx an hour ago

I think the post was missing a </sarcasm> flag.

q_andrew 2 hours ago

This is so disappointing. The closest thing we ever discovered to life on other planets and the US won't even put 0.5% of budget towards retrieving it.

DiggyJohnson 2 hours ago

That would be a MASSIVE portion of the budget for a single discretionary item.

q_andrew 2 hours ago

I guess I should clarify, I meant 0.5% to NASA in general. Right now it's 0.33%. In 2002 it was 0.72%.

TedDoesntTalk 2 hours ago

GardenLetter27 2 hours ago

And Europe is even worse, it's embarrassing.

carabiner 2 hours ago

We cannot cancel anything ever because each program is only 0.001% of the federal budget. To do so would be stingy.

sophacles 2 hours ago

Or we could look at the utterly stupid things, like maybe stop having a failed war in Iran, and just not pay for those? Thats a very big chunk of budget. As a bonus it would bring gas prices down, reduce future spending in VA and other combat veteran costs, and just possible help make the case for reducing the size and expense of our military (while still maintaining the 2 largest air forces in the world).

method_capital 2 hours ago

drstewart 2 hours ago

raverbashing 2 hours ago

Honestly this is not surprising, and as much as politics suck, the rocket equation sucks harder

Mars has a little bit less gravity than Earth

How big would a rocket need to be even to send a small payload (let's think 20kg/45lb) even suborbitally so that it can be caught by another spaceship

Now check how big a rocket has to be to send all of that from Earth

You'd probably have to send this on Starship. And refuel it while on orbit

infamouscow 2 hours ago

ALIENS! The alternative is just a bummer, so just let me live in delusion here, okay?