[Return just the main response. Take out the pre-text and the post-text]

Summarize

"Ambulocosmus, the vacuum voyager

The void of what we call space in which all the objects exist in the universe, is itself one of the most inhospitable environments that can be found, being almost empty, with very scattered atoms and particles, most of the matter is gathered by gravity in "small points" of this medium where they are formed in different varieties of celestial objects, some capable of supporting life that if exposed to this vacuum would inevitably die for the lack of material and extreme radiation, even the most resistant organisms such as microorganisms still need objects to travel between space, with enough material to survive or endure the travel.

Only organisms skilled enough to build the right structures and machines and plan their missions and trips with enough anticipation and precision tend to be the predominant beings of this vast "nothingness", however, they are simply travelers, not inhabitants, and despite that some have settled in deep spaces, none can live without the comfort of artifacts and appliances, not live wildly, without technology, but logically, that would't happen, however, there are exceptions to the rule, in this case, we speak of living beings that in the strange probabilities of the universe, not only emerged to survive space without technology, but thrived and expanded through the stars, as microbes through the face of the world. They moved through the vacuum, and conquered the hostile environment, taking advantage of the few resources with their unusual characteristics, these, the walkers of the cosmos, the Ambulocosmus.

These beings have no precedent in galactic evolutionary history, arisen from some point of deep space in some solar system (?), they apparently "Evolved" to survive and dominate space environments, without the need to go to rocky planets or any larger object to 1000 km, or depend of any kind of artificial mean to survive, being these orbiting worlds and solar systems that only touched objects when they needed it. Many suggest that they are not the product of selective pressures, but of some artificial product, made by an ancient race, which once created them for a purpose, and when they left, the feral Ambulocosmus continued its course, and others suggest an extra-galactic origin, and even extradimentional, and so the theories accumulate.
In spite of not knowing its true origin, we still have an idea of how they work, how behave, its lifestyle, and its population, among other things.

In their morphology, externally they have an appearance almost similar to that of the echinoderms, being long spheres of about 2 to 7 meters in diameter being a common size of about 5 meters, weighting at least 20 to 30 tons in earth normal gravity, with a body that has about 8 plates divided by their respective equator, with huge circular apertures in each axis, inside these apertures these a rough surface, surrounded on the edge of these by 36 to 40 small circular protuberances, and aligned with the equatorial divisions of the external plates, 4 pairs of slightly large protuberances, and in the center, another four triangular plates for each axis. The high mass that exhibits this organism even for its size is due to the attachment of several materials on its covering, which is a very dense and heavy armor 
 that seem to form 60% of the body mass.

Thanks to dissections of specimens and visualizations of them in their environment, it is known that these rare superficial characteristics are for a purpose, since these apertures have an important function in the transport and feeding of the organism. The triangular plates turn out to be mouthparts of a buccal opening which is a "bridge" of the hostile and dead vacuum, to the interior protected and alive, for the digestion of the matter on which these dark beasts sustains. The way they ingest the materials is quite interesting, an apparently efficient process to survive and obtain what is necessary to exist and develop.

It is a three-part process, the first is the collection of material, which is achieved when it clings to objects such as comets and asteroids, uses a group of several internal tentacles (a) that can extend up to 15 meters from the body, these of a very rocky texture but quite flexible to dig between the object, and thus collect enough material, from there, the mouthpaths (b) 
seal 
and the material is keept in the "first chamber" (c) which is just as protected as its shell.
Being already sealed from the void of space, the first chamber is filled with gases and other compounds by tubes in the side walls and begins to adopt the pressure inside the body, there opens the opening of the second chamber (d) where the material passes , and is crushed by huge teeth formed by a group of carbons and other elements, thus making a porridge of rocks and materials. And at the end, this porridge goes to the third chamber (e), a specialized stomach which is designed to decompose the material and prepare it for true digestion. This process of digestion tends to take days or weeks due to the amount of energy needed that is spent.
It is known that all the prepared material passes to the true digestive system of the organism, which is formed by a single spherical chamber in the center, from which it extends into several branched tubes around the body, lacking an excretory system, is theorized that all the materials, including waste materials, are reused, i.e. recycled by the use of special organs, and even with the probability that the excretory system is the same system that maintains and generates its shell, ejecting the waste but taking advantage of it, integrating it into the outer shell. They seem to be creatures with an unusual anatomy, they lack differentiated organs, being most of the organs similar to small spheres that vary slightly in color, being difficult to determine their function when the creature is already dead, and observations by use of devices in live specimens is practically unlikely since X-rays or any type of visualization in other light spectrum is useless because of the extremely dense cover of the organism that protects them of these.

The only differentiable system apart from the digestive is the nervous one, since it is characterized by a series of large nervous nodes around the axis, giving them a fairly prominent intelligence, it is believed that they are capable of calculating fairly well and coordinating in an exceptional way to be able to mobilize in space, however, do not present cognitive abilities, being more like machines in brain functions. In the equatorial divisions of the body's main plates it seems to present a series of organelles similar to "eyes", which are structured in such a way that they give a window to space in most of the light spectrum, including UV, X ray, Gamma, and Infrared.

Its system of locomotion is based on a series of organic "rockets" (f), which are located around the mouth, with the pairs of protuberances aligned to the axes, the special covers of these. They are quite conservative in their use, since the expenditure of energy and matter tends to be high, they only use it when they try to evade an object or try to fit into a food source, this they do by means of a fusion of elements in some special cameras (g), creating a chain reaction. 
To cling to objects they are able to project a series of anchor-like tentacles which work like drills and springs, compacted in a small space and that are released by a gas reaction, pushing these outside the body and penetrating the surfaces of the objects. 

As a note, something remarkable about the position of these appendices and parts as their presence in different points of the sphere is that it seems that the organism has evolved, or has been designed thinking of an environment of three-dimensional movement by the presence of the same structures in each axis of the organism, being an advantage to navigate better in this type of environments.

Their lifestyle is predominantly solitary, orbiting solar systems rich in materials, clinging and consuming objects, not much is known about their life expectancy, but thanks to studies on the shells, most of the founds tend to have a average lifespan of 50000 to 100000 years, being creatures of extreme longevity. In exceptional cases, they seem to come together in groups of several tens or in a few cases hundreds of cases, without any known objective. They do not seem to possess any kind of communication form, and their method of reproduction is still under investigation, as being very long-lived species. So far several populations have been found in about 3500 solar systems, in about 3 galactic arms, however, it is believed that there may be more of them in unexplored solar systems, giving the possibility that they have existed for dozens, hundreds and even billions of years and have expanded slowly through space."