Mars in Review

April 16, 2018

I meant to wrap up my special Mission to Mars series a few weeks ago, but then some stuff happened, and then I got sick, and my whole blogging schedule got messed up.

Anyway, better late then never.

When I launched this mission, I felt like I didn’t know as much about Mars as a space enthusiast/science fiction writer like me should.  I wanted to fix that.  I wanted to immerse myself in everything Martian, and so I did.  For a lot longer than I expected, too.

During that time, I got a much clearer sense of Mars’s history, as told by the geological and chemical evidence.  Without a doubt, Mars was a wet and water world in the distant past, but that does not necessarily mean it was an Earth-like planet. Rather, Mars’s history with water seems to have been brief and violent, with lots of flash flooding caused, perhaps, by the rapid thawing and refreezing of glaciers.

Even so, life could maybe possibly have started to evolve on ancient Mars, and even as the planet dried up, there’s a slim (very slim) chance life could have survived and endured all the way up to the present day. Scientists take this possibility seriously (a lot more seriously than I expected, to be honest), and there’s an active and passionate debate going on about how to explore Mars without contaminating any hypothetical Martian ecosystems with our Earth germs. Two of my favorite posts for this series, “Let a Mars Rover Rove” and “Mars Rovers Must Rove Responsibly,” compared and contrasted the two sides of that debate.

But of course a huge portion of this series was devoted to the future human colonization of Mars.  I wrote several posts about how to get to Mars, reviewing proposals made by Buzz Aldrin (of Moon landing fame), Robert Zubrin (author of The Case for Mars), and Elon Musk (the guy who runs SpaceX).  I also wrote about how future colonists might adapt the calendar to suit the slightly longer Martian day and the significantly longer Martian year. And of course there were all those posts about what kinds of food might be practical on Mars, starting with potatoes and working up to goat cheese.

I’m still no Mars expert.  Mars is the second most thoroughly explored planet in the Solar System, after Earth, and there’s just so much information to sort through.  On top of that, new discoveries are being made all the time.  The already enormous pile of Mars-related knowledge just keeps growing!

But I do at least feel more familiar with the Red Planet, and I hope you do to.  Thank you to everyone who followed along with this series, either for the whole long slog of it or just bits and pieces of it.  If you had any favorite posts from this Mars series, I hope you’ll let me know in the comments.  Also, I’m planning to do “Mars month” again next March, so if you have suggestions about other Mars-related things I should research, let me know!

Dining on Mars, Part 5: Goat Cheese

April 2, 2018

Over the last few months, I’ve been on a mission to learn as much as I can about Mars.  As part of that mission, I wanted to know what sorts of foods might one day be part of a Mars colonist’s diet.

We’ve already talked about potatoes and sweet potatoes. We’ve talked about lettuce and other common vegetables, and we’ve talked about entomophagy, the practice of eating bugs.  Some might balk at that idea, but insects are a highly efficient source of animal protein, and on Mars food production must be as hyper-efficient as possible.

We’ve also talked about seafood, specifically tilapia, another efficient source of animal protein.  I sort of think of tilapia as a Martian “luxury food,” though, because I feel like only a large and prosperous Mars colony could spare the room and resources needed for fish tanks.

But hey, if the human colonization of Mars is a success, more and more luxuries will be introduced.  The people of Mars may well demand it as their colonies start to feel less like research outposts more like a true civilization.  So with that in mind, let’s talk about goats.

In his book The Case for Mars, aerospace engineer Robert Zubrin has this to say about sending goats to Mars:

Some years ago a science writer wrote several books in which he popularized the idea of goats as the key to future animal husbandry in space.  They are of convenient size, omnivorous, fast breeding, milkable, and so on.  Be that as it may, I’m city born, but have lived in the more recent portion of my life in a rural area.  I’ve seen what goats can do.

I’ve tried very hard to figure out which science writer Zubrin was referring to here, but I’ve never found the original source.  Over the past few decades, the only person talking about sending goats to Mars seems to be Zubrin himself, and he only brings up the subject in order to tell us what a terrible idea it is.

You see many of the habitat structures we’ll need to build on Mars will be made of fabric or fabric-like materials, the kind of materials goats are prone to nibble on.  Goats are also known to chew on wires and cables.  Also, given Mars’s reduced gravity, these Mars goats will be able to jump really, really high, as pictured above.

Even so, I like this idea.  Goats don’t require a lot of grazing land, and they can eat much of the food waste we humans can’t digest.  They may not be as nutritionally efficient as mealworms or crickets or tipalia, but they’re still a reasonably efficient food source.

Efficient enough, I think, for the needs and desires of a truly prosperous, truly “civilized” Mars.  Finally, our Mars colonists will have meat and milk and, perhaps most luxurious of all, cheese—because few things say “civilization” better than a well-cultured cheese.

Now if we can just get grapes to grow on Mars, so we can have wine….

Sciency Words: Special Region

March 30, 2018

Today’s post is part of a special series here on Planet Pailly called Sciency Words. Each week, we take a closer look at an interesting science or science-related term to help us expand our scientific vocabularies together. Today’s term is:


It’s been several months now that I’ve been focusing almost all my research efforts on Mars. During that time, I’ve read a lot about those very special regions of Mars that might be home to alien life, but I didn’t realize until last week that “special region” is, in fact, a technical term.

Not only that, it’s a term whose precise definition has been and continues to be in dispute—exactly the kind of term most worthy of a Sciency Words post!

According to this paper from the journal Astrobiology, a special region is any region on Mars where “terrestrial organisms are likely to replicate” or where there is “a high potential for the existence of extant martian life forms.” By international agreement, NASA and other space agencies are not allowed to risk contaminating these special regions with our Earth germs. Since our current Mars rovers may not be 100% germfree, they’re all banned from exploring those areas.

But where are these regions, exactly? What are their boundary lines? This is where the definition of this term gets murky. We just don’t know enough about Mars to know which regions are special and which are not.

Initially I assumed it would be up to the International Astronomy Union (I.A.U.) to sort this out. They claim to be the sole authority on naming, categorizing, and defining space stuff. Even if you’ve never heard of the I.A.U. before, I can almost guarantee you’ve heard about at least one thing they did.

But in this case, I guess because this is a matter of international law, it’s a different organization that has to define what is or is not a special region. That organization is called COSPAR (Committee On SPAce Research), which is part of the International Council for Science. And COSPAR has been understandably reticent about setting any official definitions or drawing any official boundaries on a map. Like I said, we just don’t know enough about Mars yet.

Instead, COSPAR recommends evaluating potential landing sites on Mars on a case-by-case basis, keeping the latest scientific data in mind, to avoid contaminating any regions that might possibly someday turn out to be special (whenever we figure out what that means). According to this article from NASA, COSPAR reviews and updates the definition of “special region” every two years. Their next formal meeting is scheduled for July of 2018.

P.S.: Wait a second… who put that sign there? They better have decontaminated it first!

Molecular Monday: Mr. Asteroid’s Organic Delivery Service

March 26, 2018

A lot of what I write about on this blog, and also a lot of what I hope to do as a science fiction writer, comes from reading actual scientific research. Over the years, I’ve gotten pretty good (I think) at wading through all that scientific jargon. But sometimes I invest my time in reading something and… well, it just doesn’t give me a whole lot to work with.

There’s been a lot of press lately about how asteroids and comets deliver loads and loads of organic material to Mars, and what that may mean for our search for Martian life. I thought this would make an excellent Molecular Monday post (today’s post is part of a biweekly series called Molecular Mondays, blah blah, you know the spiel).

But after reading the actual paper, I can’t help but feel that this research has been overhyped.

Don’t get me wrong! It’s good research, as far as I’m able to judge, without any of the usual red flags I’ve learned to watch out for. But it’s based on a computer simulation, a simulation that depends upon quite a few assumptions about asteroid and comet populations in our Solar System. The authors are upfront and honest about this, and they do a good job explaining why they believe their assumptions are justified. This article from IFL Science calls these assumptions “reasonable assumptions,” and that may be true.

But still… this paper makes a lot of assumptions!

The general idea that asteroids and comets deliver organic material to Mars (and other planets) makes sense to me. The conclusion that we should search impact craters on Mars for organics seems sensible enough. It’s just… I don’t know, maybe I’ve missed something important (it wouldn’t be the first time), but with so many assumptions in play, I can’t take any of the specifics from this paper too seriously.

P.S.: I didn’t really talk about chemistry in this post, which is sort of off brand for Molecular Mondays. So I’ll just remind everyone that the word organic does not mean what you may think it means. You can have organic chemicals and organic chemistry without having living organisms.

Sciency Words: Science Autonomy

March 23, 2018

Today’s post is part of a special series here on Planet Pailly called Sciency Words. Each week, we take a closer look at an interesting science or science-related term to help us expand our scientific vocabularies together. Today’s term is:


The planet Mars now has its own super villain. In 2016, NASA uploaded new software to the Curiosity rover, giving it a program called AEGIS (Automated Exploration for Gathering Increased Science). Curiosity was already equipped with a high powered laser. Thanks to AEGIS, the rover is now free to use it with or without the input of humans back on Earth.

To quote this article from the Planetary Society:

AEGIS is an example of what we call “science autonomy’, where the spacecraft (the rover in this case) can make decisions on its own about scientific measurements and data—choosing which measurements to make, or having made them, which to transmit to Earth. This is distinct from autonomy in navigation, or in managing onboard systems—both of which Curiosity can also do.

Okay, in all seriousness, I think this is a great idea. One of the biggest frustrations about robotic space exploration is all the time wasted transmitting data back and forth across the Solar System. Due to speed-of-light delays, it can take many minutes, or even hours, to tell a rover what to do and then receive confirmation that the rover has done its job.

With regard to Curiosity’s laser, that instrument is used to vaporize Martian rocks. The resulting rock vapor is then spectroscopically analyzed to identify the rock’s chemical composition. Letting Curiosity do that sort of science on its own has, according to that Planetary Scociety article, saved NASA from a lot of wasted time and effort.

Even so, I can’t help but feel like, if we lived in a comic book universe, this science autonomy thing would be a very, very bad idea. Especially when laser are involved.

Mars Rovers Must Rove Responsibly

March 21, 2018

We’ve sent several robotic space probes to Mars already, and several more will be heading to the Red Planet in the next few years. Mars is already the second most heavily explored planet in the Solar System, after Earth.

But our robots are forbidden by international law from entering regions where Martian water appears to be flowing, or regions where Martian life could hypothetically exist. Why? Because there’s a chance that microorganisms from Earth hitched a ride aboard our space probes, survived the journey to Mars, and might start to grow and reproduce if they’re exposed to Martian water.

Yesterday, we talked about a paper in the journal Astrobiology which argued that the risk of contamination is minimal, and we should let our Mars rovers do their jobs. Go explore, and if there’s Martian life, go find it! Today we’re looking at a response to that paper, also published in Astrobiology, in fact in the same issue of Astrobiology. A response which raises several concerns, such as:

  • In the last few decades, we’re learned that Earthly microorganisms can be far more resilient than we ever imagined. Some of them very well might survive—and thrive—on Mars.
  • We’ve also learned that Mars is far less hostile to life than we previously assumed. Quite a few microbes from Earth might find Mars a rather comfortable place to live.

Taken together, these two points suggest that we have not overestimated the risk of contaminating Mars. In fact, we may have drastically underestimated the risks, and we need to be more careful, not less careful, about where we let our Mars rovers go. Otherwise:

  • We might destroy the very Martian life forms that we’re so desperately hoping to find.
  • We might make Mars’s water undrinkable for future human settlers.
  • We might end up misidentifying a stowaway microbe from Earth as a new form of life native to Mars, and the authors of this response paper argue that even our best gene sequencing technology might not be able to clear up the potential confusion.

Even if our Mars rovers keep their distance from Mars’s potentially-habitable or potentially-inhabited areas, there’s still a lot of valuable science they can do, especially when they’re investigating areas that used to be lakes or rivers, areas that could have supported lots and lots of alien life in the past, even if they’re bone dry and very thoroughly lifeless in the present.

So let’s take things slow. Let’s stick to the original plan (and current international agreements) and continue to explore Mars in a responsible and methodical manner.

Or maybe not. Gosh, I don’t know. After reading these two papers back to back, I really don’t know what to think.

Let a Mars Rover Rove

March 20, 2018

In the near future, human beings will probably set foot on the planet Mars. Human beings will likely do a lot of other things on Mars too: coughing, sneezing, peeing, pooping… it won’t be long until Mars is thoroughly contaminated with our germs.

We may have contaminated Mars already, at least a teeny bit, with our robotic space probes. You see, these probes may not have been as thoroughly cleaned and sterilized as they were supposed to be before they left Earth. Consequently, our Mars rovers, like the Curiosity rover, are forbidden from entering or even approaching sites where liquid water may be present.

This is to ensure that we don’t endanger any native Martian life that could hypothetically be living in those watery areas. It’s also to ensure that we don’t misidentify Earth germs as native Martian microbes at some point in the future.

But according to this paper published in the journal Astrobiology, we really should lighten up and let our Mars rovers do their jobs. We’ve spent billions on these robots, and we’re not using them to their best. While there is some risk of contamination, it’s only a small risk, or so the authors of the paper claim.

First off, the Martian environment is extremely cold, there’s lots of radiation, and an abundance of harsh, oxidizing chemicals in the soil. In short, Mars can do a better job sterilizing out space probes than we can. The very few Earth germs that might have made it to Mars thus far wouldn’t be able to spread far.

As for misidentifying an Earth germ as a Martian microorganism, the authors of the paper claim this wouldn’t be a problem. At this point, we have a pretty good idea which Earthly bacteria could have hitched a ride to Mars, because we know which bacteria were later found in the clean rooms where our space probes were built. Those bacteria can be easily identified with gene sequencing.

So let’s send the Mars rovers in. Let them do their jobs. Let them study Mars’s recurring slope lineae and other watery features, or any other areas where life could possibly exist. Let’s do this now, while the risk of contamination is still relatively low, because the humans are coming, and they’re bringing a whole lot more germs with them!

Or maybe not! As I’ve said before, these kinds of scientific papers should be understood not as final declarations of fact but as part of an ongoing conversation among scientists. In tomorrow’s post, we’ll talk about the other side of the argument.