The ESA-supported project started in 2005, and would use a propellant based on liquid oxygen and hydrogen.
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The concept calls for a two-stage rocket that would be powered by engines burning liquid oxygen and kerosene.
Water from asteroids could be broken down in space to liquid oxygen and liquid hydrogen for rocket fuel.
Liquid-fuelled rocket engines work by mixing the fuel (in this case kerosene) with liquid oxygen at high pressure.
The Ariane's core stage, which is prepared in northern France, uses liquid hydrogen and liquid oxygen as its propellants.
They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
It is a two-stage rocket powered by liquid oxygen and kerosene.
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This architecture also enables NASA to leverage existing capabilities and lower development costs by using liquid hydrogen and liquid oxygen for both the core and upper stages.
To do that they need not one but two energy-hogging air chillers, one to make liquid oxygen and another to remove CO 2 from the flue gases.
This means they do not have to carry liquid oxygen (or some other oxidant) to burn their fuel, and could thus use the weight saved to carry a bigger payload.
The liquid-oxygen cylinder at the foot of the neatly made bed was filled and working properly.
To simulate the atmosphere, they have built a special cloud chamber of their own, with the air manufactured from scratch, using liquid nitrogen and oxygen together with precise amounts of trace compounds, including sulphuric acid and ammonia.
Professor Sisson determined that the steel was attacked by a liquid slag which contained iron, sulphur and oxygen.
Officials packed long metal tubes -- called "carrier pigeons" -- with oxygen, vaccines and sustenance, liquid proteins and vitamins at first because the men were not ready for solid food.
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