This text originally appeared on Universe Today.
Getting to Mars takes a extremely very long time, about 9 months utilizing at the moment’s rocket technology. It is because common rocket engines burn gasoline and oxygen collectively (like a automobile engine), however they’re not very environment friendly. The basic drawback is that spacecraft should carry each gasoline and oxidizer since there’s no air in house to assist combustion. This creates a vicious circle: The extra gasoline you carry to go sooner, the heavier your spacecraft turns into, requiring much more gasoline to speed up that additional weight. To go sooner, you’d want huge quantities of gasoline, making the rockets extremely costly and heavy. Present chemical propulsion techniques are nearly at their theoretical limits, with little room for enchancment in effectivity.
While NASA funding has been slashed by the Trump administration with no allocation for nuclear thermal propulsion and/or nuclear electric propulsion, scientists on the European Space Agency (ESA) have been finding out nuclear propulsion. Right here’s the way it works: As a substitute of burning gasoline with oxygen, a nuclear reactor heats up a propellant like hydrogen. The super-heated propellant then shoots out of the rocket nozzle, pushing the spacecraft ahead. This methodology is way more environment friendly than chemical rockets.
Revisiting Nuclear Rockets for Mars
Nuclear rockets provide a number of key benefits, reminiscent of slicing Mars journey occasions in half—from 9 months to about 4 to five months. The effectivity positive aspects come from the truth that nuclear reactors produce way more vitality per unit of gasoline than chemical reactions. Surprisingly, astronauts would truly obtain much less dangerous radiation on shorter journeys, although the engine itself produces radiation. This occurs as a result of house vacationers are continually bombarded by cosmic radiation throughout their journey, and slicing journey time in half considerably reduces their whole publicity. These engines work greatest for giant spacecraft that want to hurry up and decelerate dramatically, good for Moon and Mars missions the place speedy velocity modifications of no less than 25,000 km/h are required.
The examine, known as “Alumni,” prioritized security by cautious design. The nuclear reactor solely activates when the spacecraft is much from Earth in a protected orbit. Earlier than activation, the uranium gasoline has very low radioactivity and isn’t poisonous. A number of radiation shields defend the crew throughout the quick engine burns that final lower than 2 hours. The reactor is designed by no means to return to Earth’s ambiance. The analysis workforce spent over a 12 months analyzing this expertise and concluded it’s possible for long-term improvement. Nevertheless, there’s nonetheless important work forward, together with laboratory testing of the brand new ceramic-metal reactor design, constructing protected testing amenities, and fixing technical challenges like gasoline sourcing and reactor restart techniques.
Nuclear thermal propulsion might revolutionize house journey, making missions to Mars and the Moon sooner and extra sensible. Whereas the expertise is promising and seems protected, it is going to take a few years of improvement earlier than we see nuclear-powered spacecraft heading to the Purple Planet. It’s nice to see Europe demonstrating that it has the experience to develop this expertise, doubtlessly ushering in a brand new period of space exploration the place distant worlds change into extra accessible than ever earlier than
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