Mercedes Mullins
The use of fossil fuels in spaceships is not a given—there are several alternative ways to power a spaceship. For example, electricity can be used to generate hydrogen, which can then be used as fuel. Hydrazine is another fossil-fuel-free option for powering spaceships, as demonstrated by China's space program. Other options include ethanol, liquid hydrogen, methane, synthetic fuels, nuclear power, solar power, wind power, geothermal power, hydroelectric power, and electromagnetic launch loops or orbital rings.
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What You'll Learn
Hydrogen fuel
Hydrogen has a few major advantages for aviation: it is readily available and can be efficiently produced as a petroleum byproduct, through electrolysis, or through other innovative technologies. As a liquid or pressurised gas, it is relatively easy to transport and quick to refuel. Hydrogen burns cleanly, producing nothing but pure water as hydrogen atoms bond with oxygen. This clean combustion helps reduce the environmental impact of space missions.
Liquid hydrogen has a low molecular weight, and its efficiency means it can store a substantial amount of energy within a relatively small volume. A higher specific impulse means that liquid hydrogen can produce more thrust for a longer time and has better fuel efficiency. This allows rockets to go farther and faster while using less fuel.
NASA is pursuing a variety of alternative power sources for aerospace vehicles, including fuel cells. They are building on their success with the Gemini, Apollo, and Shuttle alkaline fuel cell power system development and operations. The Department of Energy (DOE) and private industry have made advances in Proton Exchange Membrane (PEM) fuel cells using hydrogen and air as the fuel and oxidant for ground transportation applications. NASA is also building upon these PEM developments to advance fuel cell technologies, providing reliable, compact, and high-energy renewable power sources for aerospace applications.
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Nuclear power
Nuclear propulsion has been a key area of focus for NASA since 2016, with the aim of developing nuclear thermal propulsion technology. This includes fuel element manufacturing, engine performance analysis, and establishing safe and affordable engine testing approaches. Nuclear propulsion can provide much higher power for onboard instruments and communication systems, especially when compared to solar power as spacecraft travel farther from the Sun.
Nuclear reactors in space must operate at extreme temperatures, with nuclear electric systems exceeding 1,700 Fahrenheit and nuclear thermal systems requiring temperatures above 4,800 Fahrenheit. The United States has been investigating the use of nuclear propulsion for space applications for several decades.
One example of a nuclear reactor designed for space exploration is the HOMER-15, a small fission surface power system intended for the Moon and Mars. It operates at 600°C and has a total mass of 214 kg, making it more suitable for space applications than larger and heavier reactors.
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Renewable energy
Fossil fuels are currently the primary energy source on Earth. However, renewable energy sources have been used for a long time and did not require fossil fuels as a prerequisite.
A spaceship could function in space without fossil fuels by utilizing renewable energy sources such as solar power, batteries, and unstable atoms. Solar power, or energy from the Sun, is routinely used by spacecraft today. Solar panels convert the Sun's energy into electricity, which can be stored in batteries and used to power the spacecraft even when it is not in direct sunlight. This technology has been used to power spacecraft on Mars and Jupiter. However, solar power becomes less efficient as spacecraft travel farther from the Sun and may be limited by harsh radiation and dusty environments.
To address the limitations of solar power, scientists have developed alternative power sources for spacecraft, such as improved batteries that can store more energy in smaller sizes and last longer. Batteries are designed to work in extreme environments and can be recharged multiple times. Another option is to use unstable atoms, called radioisotopes, which release energy as heat when they fall apart. This heat can be converted into electricity using a radioisotope power system.
Additionally, there are theoretical concepts for renewable energy sources that could power spacecraft in the future. One idea is to use solar sails that are hit by massive mirrors funneling a star's light, propelling the vessel. Another concept is the cavitron, which involves creating artificial gravitational singularities to produce energy in the form of Hawking Radiation.
The development and utilization of renewable energy sources for spacecraft propulsion are ongoing areas of research. Sustainable propulsion technologies, such as solar cells and electric propulsion systems, are gaining attention for their potential to provide efficient and environmentally friendly solutions for space travel.
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Synthetic fuel
The use of synthetic fuel is one way that spaceships could function in space without relying on fossil fuels. Synthetic fuel can be produced from various sources, including coal, solar energy, water, biomass, and captured carbon dioxide or methane. This carbon-neutral process enables sustainable aerospace transportation by recycling carbon through the carbon cycle. The consumption of hydrocarbon fuels emits carbon dioxide into the atmosphere, which is then used by plants for photosynthesis. The plant matter becomes feedstock for animals or humans, producing organic waste that can be fermented to create biogas, a mixture of carbon dioxide and methane. This biogas can be converted into fuel for aerospace purposes.
The development of synthetic fuels is particularly relevant as access to space becomes more frequent and affordable. With the increasing number of rocket launches and emissions in the atmosphere, there is a growing need to consider green fuel options. SpaceX founder Elon Musk, for example, has emphasized the importance of rocket reusability in reducing the costs and environmental impact of space travel.
Additionally, synthetic fuel production offers advantages in terms of energy density and efficiency. Chemical fuels, including fossil fuels, are valued for their high energy density, making them ideal for powering vehicles like rockets. However, synthetic fuels can be designed to provide similar or even enhanced energy densities while also being more environmentally sustainable.
Moreover, synthetic fuels can address the challenges associated with energy storage in battery-powered vehicles. While battery technology has improved, it has historically struggled to match the range and power offered by chemical fuels. Synthetic fuels, on the other hand, can provide the necessary energy density and propulsion for space travel while potentially reducing the environmental footprint.
In conclusion, synthetic fuels offer a promising alternative to fossil fuels for space travel. By utilizing diverse feedstocks and carbon-neutral processes, synthetic fuel production enables sustainable aerospace transportation. As the demand for space access increases, synthetic fuels can play a crucial role in reducing emissions and environmental impact. Additionally, the energy density and storage capabilities of synthetic fuels make them a viable and efficient option for powering spaceships without relying on fossil fuels.
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Hydrazine
The chief benefit of using hydrazine is that it can produce over 200 mW/cm2 more than a similar hydrogen cell without requiring expensive platinum catalysts. Because it is a liquid at room temperature, it can be handled and stored more easily than hydrogen. By storing hydrazine in a tank full of a double-bonded carbon-oxygen carbonyl, the fuel reacts and forms a safe solid called hydrazone. By then flushing the tank with warm water, liquid hydrazine hydrate is released.
Despite its benefits, hydrazine is toxic to humans.
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Frequently asked questions
There are several ways in which a spaceship could function without fossil fuels. Firstly, electricity can be used to generate hydrogen, which can be utilised as fuel. Hydrogen can also be produced by splitting hydrocarbons. Hydrazine is another potential fuel source for spaceships, as demonstrated in China's early space programme. Additionally, renewable energy sources such as nuclear, solar, wind, geothermal, and hydroelectric power can be harnessed for space exploration. Furthermore, with advanced technology, an electromagnetic launch loop or an orbital ring could propel a spaceship without the need for any fuel.
Alternative fuel sources that do not depend on fossil fuels include synthetic fuel produced from coal or "green" electric power, as well as liquid hydrogen or methane.
While electricity can be used for propulsion, it is currently insufficient for powering a spacecraft into orbit. However, it can be utilised for ground-based electric launch systems, particularly when there are no human passengers.
By using alternative fuel sources, spaceships can reduce their environmental impact and dependence on non-renewable resources. This promotes the utilisation of renewable energy sources and contributes to the mitigation of climate change.
One challenge is the economic feasibility of certain alternative fuel sources. For instance, electrolysis, which can be powered by nuclear energy, is not economically incentivised due to the high costs involved. Additionally, alternative fuel sources may face technical challenges, such as the difficulty in storing energy efficiently without utilising fossil fuels.
