Science, Fiction, Life

Category: zerg

How do Zerg Fly in Space? Part 1: Mutalisks

Ok folks, it’s time. We’ve all asked this question, but I’ve been putting off answering it because we all actually know the answer.

How do the Zerg fly in space?


There’s a certain point in sci-fi or fantasy where you have to just suspend disbelief and go along for the ride, and I think that the Zerg ability to travel through space is a good example of this. That said, I’d like to take a look at one of the most common explanations that people give to justify the mutalisk’s ability to flap its wings and propel itself through space. As you’ll see, it’s completely implausible.

Now, we know that flapping doesn’t do anything in a vacuum: there’s nothing to provide any resistance, so you can flap all you want and it won’t move you forward. But what if mutalisks used their dragon-like wings as solar sails, catching the photons from a nearby star to cruise through interplanetary space? That might not explain the flapping, but it could explain how they can move, so let’s take a closer look.

The idea behind solar sails is the conservation of momentum. Even though photons of sunlight have no mass, they do have momentum. High school physics tells us that momentum is conserved, so if you have a bunch of photons with momentum being absorbed by a solar sail (or a mutalisk’s leathery wing) then their momentum must be transferred to the thing they’re hitting, exerting a force on it and causing it to move through space. So, how large would a mutalisk’s wings have to be to let it accelerate at a reasonable speed? To figure this out, we need to do a back of the envelope calculation, making some assumptions about how big mutalisks are.

In general, the sizes of units in the game are not reliable: I prefer to consider the cinematics as the authoritative source. So let’s take a look at this cinematic showing Jim Raynor’s battlecruiser being attacked by a swarm of mutalisks.

At about six seconds, one of the mutalisks flies over the right-hand side of the battlecruiser and crosses near a long row of windows. Based on its size compared to the set of windows, I would say that the creatures have a wingspan of around 100 meters and that their tube-like body is about the same length and maybe 5 meters across. If mutalisks are like most earth life, then they are mostly water. to get a rough idea of their weight we can calculate their volume and then multiply by the density of water. A cylinder 5 meters by 100 meters has a volume of about 2000 cubic meters. That would correspond to a whopping 2,000,000 kg or 2000 metric tons!

Now, obviously that’s too big for something to fly in at atmosphere, let alone in space by flapping its wings. But lets be generous and say that maybe mutalisks are made of some very low-density material, and maybe I overestimated their size. What if they were closer to 20 tons? How much oomph would their wings give them if they used them as solar sails. Again I’ll be generous and treat the wings as a square of material 100 meters on a side.

The momentum of a photon is given by: Momentum = Energy/Speed of Light, so near a sun-like star, where most photons are in the visible range, they have an energy of 2-3 electron volts, yielding a momentum of 1.6×10^-27 kg m/s per photon. That’s not much, but a star puts out a lot of photons, so let’s see if that balances it out and gives us a decent thrust.

Let’s say our theoretical mutalisk is orbiting the sun at the same distance as Earth, 150,000,000,000 m from the sun. The sun puts out 3.8×10^26 watts or roughly 8×10^44 photons per second, but that power is spread out in all directions. To figure out how much hits our solar-sailing mutalisk, we have to imagine spreading that power out over a sphere the size of our mutalisk’s orbit with a surface area of 4*pi*R^2 where R is the radius of the orbit. That gives 2.25×10^20 photons per square meter per second.

Solar sails don't make for the most maneuverable spacecraft, and they would be sitting ducks in any sort of space battle.

With a wing area of 100 m x 100 m (10,000 square meters), our mutalisk would intercept around 10^24 photons per second, corresponding to a whopping force of 0.0004 newtons! That’s enough force to accelerate a 20 ton mutalisk up to about 14 miles per hour in a year.

Edit: An astute reader points out that the size of mutalisks is described in the Starcraft novels as being much smaller than I described. They apparently have a wingspan of 20 feet and are only 7 feet long and about a meter across. to me that seems shockingly small, especially compared to the cinematics, and it also seems quite stubby compared to all of the art depicting mutalisks as having a body that is a long tube. Still, we can scale the above results to fit these new dimensions. Given a cylinder 7 feet long and 3.3 feet across, and again assuming a density like water, I get a mass of 1.7 metric tons. If we treat the wings generously as a 20 foot square, then their surface area is 37 square meters, so the thrust on wings of that size as compared to our 10,000 square meter example above would be .0004 newtons x .0037 = 1.5×10^-6 newtons. That’s enough to accelerate our 1700 kg mutalisk all the way up to 0.06 miles per hour in a year! Even assuming a much lower density, it would only accelerate a 170 kg mutalisk up to 0.6 miles per hour in a year.

You might not have followed every step of that (admittedly very crude) calculation, but that final value should give you some idea of how ridiculous it is to say that a Mutalisk’s wings could work as solar sails. Even assuming very large wings and a small body, the acceleration that you get is miniscule. Plus, solar sails are really only good for accelerating away from the star, and Mutalisks are like fighter jets: they need to be able to dodge and weave in all directions very quickly.

Bottom line, I can’t explain how the mutalisks fly in space. Heck, I can’t explain how something that big flies in air! Solar sailing certainly doesn’t cut it, so we’re left where we began. It’s magic. This is a part of the Starcraft Universe that just doesn’t fit with the laws of physics in our own universe, and that’s fine. Mutalisks are still cool, and it’s not like I’m going to stop playing Starcraft because I don’t know how they can fly in space.

Stay tuned: next I’ll take a look at all the non-winged Zerg fliers!

The Color of Acid

The other day I was playing Starcraft 2 and trying to think of the next topic to tackle here. As I watched a swarm of zerg roaches attack a group of terran marines, I realized that I needed to talk about acid. Two of the new zerg units, the baneling and the roach have acid-based attacks. The baneling is a little suicide bomber that detonates, splashing corrosive acid all over nearby units, while the roach is a nasty armored insect that spews a stream of acid on its foes from a distance.

Banelings doing their thing.

I like both of these units in the game, but they perpetuate a myth about acid that has infested pop culture for years: it is bright neon green. I’m not sure where this idea originated. Maybe it goes back to World War I, when chlorine gas was used as a chemical weapon. It’s not an acid, but it is a nasty caustic chemical that is a sickly green color. Or maybe the green acid idea can be traced back to the movie Alien, where the alien is revealed to have highly acidic blood that looks greenish yellow.

The famous shot of the alien's acidic blood in Alien.

Whatever the origin of the idea, it’s patently false. Most acids are colorless in both their pure form and in solution. Sulfuric acid? Colorless. Hydrochloric acid? Wikipedia says that it is colorless to light-yellow, but I’ve never seen an example that showed any color. Hydrofluoric acid? Colorless.

I don’t know of any acid that is brightly colored, though I admittedly not a chemist. There are probably some nice, colorful organic acids, and it’s certainly possible for acid to be mixed with other colored stuff in a solution, but in the real world acid does not conveniently advertise its corrosiveness by being bright green.

While we’re on the subject, let’s talk about the plausibility of an insect spraying acid, whatever the color may be. This is actually plausible to me. There are plenty of examples of insects that are armed with chemical-based weapons. One of the most famous is the bombardier beetle, which defends itself by blasting a nasty, boiling hot liquid at its attackers. Bee venom contains formic acid, and many ants inject or spray formic acid or other chemicals when they bite.

If we’re willing to suspend disbelief enough to allow the zerg to exist in the first place, I’m also willing to grant that they might use caustic chemicals to attack, since real-world insects do this too.

Understanding the Starcraft AI

Apologies for the lack of posts lately. You see, I didn’t properly plan my life around the release of Starcraft 2, so instead of being able to spend the weeks after the release playing the game and blogging here, I had to go get married and go on my honeymoon. I know, I know, I need to get my priorities straight.

The results of a typical AI battle in Starcraft: Brood War. The Protoss basically dominate.

Anyway, before I launch back into the Science of Starcraft, I thought I would share this post about the Computer Science of Starcraft over at Twenty Sided. You may be good enough at Starcraft to regularly beat the AI, but I’m not. I’m just too slow. So I was interested to hear the results of this experiment, where Shamus set up a map with seven AI players and a human observer, and ran it repeatedly, tabulating the results to learn a little more about how the AI ticks. He found (somewhat unexpectedly) that the computer was by far most effective with Protoss and worst with Terrans. He also has some interesting observations about how the AI uses special abilities like the Templar’s psi-storm agains human players and computer players:

I’ve come to suspect that the AI cheats a bit and detects clusters of units which have been grouped by hotkey by human players. This is very naughty if it’s true.

Anyway, it’s an interesting look at the AI of the original Starcraft. The custom map is even available to download if you want to try the experiment yourself!

Can Life Really Survive in Space?

A zerg swarm, silhouetted against some colorful nebulae as they cross the vacuum of space.

In Starcraft, the biological, hive-minded Zerg can survive and even thrive in the vacuum of space, while the more fragile humans (and presumably the Protoss) require some sort of space suit. So that got me wondering: How plausible is it for living organisms to be able to withstand the vacuum, extreme temperatures and high radiation levels of space?

Fist of all, I’m going to set aside how the Zerg fly around in space. That may be the subject of a future post. I’m more concerned with just the idea of a hydralisk standing on an exposed moon-like surface and not immediately freezing or suffocating or otherwise dying gruesomely. Continue reading

Starcraft Plot Summary

For those of you who are not familiar with the Starcraft universe, but are interested in Starcraft 2, either because you’ve heard about the game or because you want to follow this blog but have no idea what I’m talking about when I make game references, here is an excellent summary of the plot from the original Starcraft:


Could Cloaking Devices Work?

By now, you have probably seen the absolutely epic Starcraft 2: Ghosts of the Past trailer. If not, take a look at this, and pay particular attention to the depiction of Sarah Kerrigan’s cloaking device at about 11 seconds in:


Cloaking is common in science fiction: Star Trek pioneered it with the Romulans, and other popular franchises like Star Wars and Predator and Halo have used it. And of course in Starcraft and Starcraft 2 both the Terrans and the Protoss have a whole variety of cloaked units. But could it really work? You may be surprised to learn that the answer is yes!

Obviously, this sort of technology would be extremely useful for the military, so they are funding research into technologies that could make it a reality. There are basically two ways that you could achieve “cloaking”. The first way would be to actually divert light around the cloaked object, so that it appears not to be there. Continue reading

What is Zerg creep, really?

Artwork from StarCraft, showing a creep-infested platform near the planet Char.

“What the hell is that? Looks like the ground there is alive.” – Jim Raynor

Creep: that purple, fibrous, living mat that extends from zerg “buildings”. Its ominous presence always tells you you are entering unsafe territory, unless of course you’re playing as zerg, in which case it says “welcome home”! But what exactly is it?

Well, let’s think about it scientifically. It is produced by zerg buildings and spreads across any available surface. According to the Starcraft Wiki (which I will use as an authoritative source for all the minutiae of StarCraft trivia that I don’t know) Creep has a cellular structure: it’s not just mucus. The Wiki also says that creep can absorb sustenance from the underlying terrain, that it can be spread by “spores” or excreted by several units, and it provides nutrients to zerg buildings. It is averse to high temperatures but can grow in space and over water.

So, does any real-world living thing match this description? Surely not, right? Wrong. Continue reading

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