Engineering
Projects for studying the viability of certain technologies that will enable life on Mars
Martian GPS
by Ariadna Farrés Basiana
The classical way to move around the Martian surface is by taking advantage of the communication provided by the different satellites on Mars, which is how the different Mars rovers have been operated in the past. These connections are not constant and could be jeopardized in case of a satellite failure. At the MDRS, we will explore two different options to navigate around the martian dessert and find our way around the planet. One, by using the night sky, where we will identify reference stars that can help us navigate the same way we do on Earth with Polaris. Second, by building a small GPS network constellation using CubeSats. Given the lower gravity on Mars and its thin atmosphere, little fuel would be necessary to put a set of CubeSats in orbit and start building the constellation. We will focus on determining the requirements to building such a network, for instance, how many CubeSats satellites would be needed and how should they be deployed to ensure full coverage of a large vicinity of our Mars Base Camp.
Organic Bateries
by Neus Sabaté
Since the launch of Explorer in 1958, batteries have been used in Earth orbital and planetary spacecraft to supply primary electrical power or store electrical energy generated by on-board solar or radioisotope power systems. These energy storage systems are used on spacecraft for various functions, being the most relevant ones: to provide power to the spacecraft subsystems before deployment of the solar panels, fire rocket motors for mid-course correction, meet temporary power needs during eclipse periods, provide power for payload instruments and meet peak power demands derived from data transmission or surface mobility. Primary batteries (single discharge only) are typically used in missions, such as planetary probes, that require electrical power for a period of a few minutes to several hours. Rechargeable batteries (also referred to as secondary batteries) are used mostly in solar-powered spacecraft to provide electrical power during eclipse periods and for load levelling. When considering Mars Surface Missions, the need of advanced rechargeable batteries with high specific energy, energy density, cycle life capability and low-temperature operational capability has been largely identified. Perseverance rover, for example, carries a radioisotope power system that uses the heat of plutonium’s radioactive decay to generate a temperature gradient on a thermoelectric generator. The generated power is stored in two rechargeable lithium batteries. The power generator weights 50 kg (5 kg corresponding to plutonium) and produced approx. 100 watts. The generated energy is partially stored in the batteries in order to provide power to the rover overnight. Although this solution is dimensioned to provided constant power for at least 10 years of operation, it is clear that it cannot be the sole source of power for portable/movable appliances. Yet, to meet peak power demands, the energy has to be stored in large (and therefore heavy) batteries that have to be transported to Mars in future missions. Ultimately, this turns into a heavy expense of fuel and need of space in every mission.
To ease this concern, I propose to proceed in the same way as my research group is already doing on Earth: to built-up batteries from the rough and abundant materials present on the planet surface. On Earth, we seek for identification of organic and inorganic electroactive compounds present in organic waste and test their capability to be oxidized or reduced in primary cells. Therefore, the main idea of the application is to build up a primary battery with the compounds available on Mars. In particular, Mars surface seems to be rich on Mg, which is a well-known anodic material for primary Mg-air batteries. However, as the oxygen content of Mars atmosphere is very limited (< 1%) an alternative cathodic compound must be found. In this sense, the planet is rich on iron oxides and their derivatives – which could be explored as cathodic candidates.
Building Blob’s house
by Cesca Cufí-Prat
Physarum polycephalum (here after physarum), commonly known as “blob”, is an example of plasmodial myxomycetes (commonly named plasmodial slime molds) that consists of a multinucleate single cell amoeba like organism. Its size is commonly of a few centimeters of diameter, and it can move within speeds of few centimeters per hour. This curious creature shows rare learning capabilities for a single celled organism. During its plasmodial state, the physarum explores its surroundings in search of food. It is capable of memorizing its previous path and of finding the optimum one towards the food sources. Slime molds are not only surprising for its learning capabilities but for being extremely resistant: in the lack of food supplies or adverse environmental conditions they produce spores that are highly resistant to harsh environment and can stay dormant for decades waiting for the proper conditions to germinate.
The project Cellular intelligence on martian surface aims at studying the exploration behavior and sporulation triggering of physarum under the influence of UV, visible and infrared radiation analog to the one in martian surface. If we think about the possibility of performing the same research on Mars to have in situ radiative conditions, we would need a safe space and protocol in order to avoid any leakage leading to contamination inside or outside a martian station. In parallel to the scientific study, this project aims at designing and constructing a safe container to perform such research for our mission at the MDRS.
Humans are allergic to change. They love to say the most damaging phrase in the language, which is: ‘It’s always been done that way’. I try to fight that. That’s why I have a clock on my wall that runs counterclockwise.
— Grace Hopper, rear admiral and pioneering computer scientist