Heres a bit of fun fact on Space Marines
Space Marine Daily Rituals
The Rules of the Warhammer 40k universe is that everything is big.
the picture below is a great example of the scale of the universe
also heres the list of augmentations the marines get
Implantation
Nineteen organs are implanted in a Neophyte to further bolster his combat and survival ability should he live to become a Brother-Marine. Each implant has a high margin of catastrophic failure and so only a small number of Neophytes live to become Initiates.
Secondary Heart - This is the first and least difficult implant to install. The Secondary Heart increases blood supply and pumping capacity and is capable of taking over entirely should the primary heart fail.
Ossmudula - This implant strengthens the skeleton of a Space Marine. Two years after the surgery, the Marine's skeleton will be exponentially stronger; and the rib cage will be fused into a solid bone plate.
Biscopea - Implanted into the chest cavity, this implant bolsters muscle growth throughout the Marine's body
Haemastamen - Implanted into a main blood vessel, the Haemastamen alters the Marine's blood composition to carry oxygen and nutrients more efficiently.
Larraman's Organ - This organ manufactures Larraman Cells. These serve the purpose of platelets, but act faster and more effectively. When a Marine is wounded, Larraman Cells are released, attached to leukocytes. At the site of the injury, they form scar tissue in a matter of seconds, effectively preventing massive blood loss and infection.
Catalepsean Node - Implanted into the back of the brain, this implant allows a marine to not sleep, instead entering a four-hour, almost comatose trance where they "recharge". The longest any space marine has every been on active combat duty without rest is 319 hours by the Crimson Fists.
Preomnor - The Preomnor is a decontamination chamber inside the chest cavity. It chemically analyzes ingested materials and neutralize toxins. The Preomnor enables the Marine to eat normally inedible substances and resist poisons.
Omophagea - Implanted into the spinal cord, this organ is designed to absorb DNA related to experience or memory. This enables the Marine to gain information, in a survival or tactical sense, simply by eating an animal indigenous to an alien world or situation.
Multi-lung - The multi-lung is a 'third' lung, able to absorb oxygen from environments poor in oxygen. Breathing is accomplished through a sphincter in the trachea. A similar muscle closes in toxic environments and oxygen is absorbed by filtering out the poisonous elements.
Occulobe - Essentially, this organ enhances a Marine's eyesight, granting him exceptional vision and the ability to see normally in low-light environment.
Lyman's Ear - This implant renders a Marine immune to dizziness and nausea(see Cochlea), and enables a Marine consciously filter out "white noise".
Sus-an Membrane - This implant allows a Marine to enter a catatonic or "suspended animation" state. It can allow a mortally wounded Space Marine to survive his injuries, and bring the metabolism to a standstill. The longest recorded period of this state was Brother Silas Err of the Dark Angels for 567 years.
Melanochrome - Linked to pigment cells in skin, this allows the Marine's skin to shield him from dangerous levels of radiation.
Oolitic Kidney - This organ works in conjunction with the Preomnor, filtering blood to remove toxins.
Neuroglottis - This organ allows a Marine to assess a wide variety of things simply by taste. From poisons to chemicals to animals, a Marine can even track its quarry by taste alone.
Mucranoid - Altering sweat glands, this organ secretes an oily substance that coats the skin, protecting it from extreme temperatures and to some extent, vacuum environments.
Betcher's Gland - Implanted into multiple locations inside a Marine's mouth, these glands transforms a Marine's saliva into corrosive, blinding acid.
Progenoid Glands - Implanted into both the neck and chest cavity, these serve to collect and cultivate the gene-seed from a Space Marine's body, and to safeguard it for the continuity of a Chapter.
The Black Carapace - The last and possibly most important of all implants, this neuroreactive material is implanted directly under the skin. After a few hours, the material hardens and interlinks with the Marine's own nervous system. Points are then cut into the Carapace which allows a Marine to directly interface with his Power Armor