Ingesting this slower air allows an engine to burn its fuel more efficiently while generating the same amount of thrust.
The X-43A, or "Hyper-X" was built specifically to test scramjets, or supersonic ramjets, which burn fuel in air travelling at supersonic speeds.
The Chinese have severe air pollution problems and they want to burn more gas, but gas is expensive, supplies are unreliable and they can't get enough of it.
But I also want to work with this Congress to encourage the research and technology that helps natural gas burn even cleaner and protects our air and our water.
For instance, when you do combustion studies, flames on Earth burn in a teardrop fashion because the air comes in from underneath it and feeds the flame, but we can't do that here since the air doesn't know where up is, there's no convection.
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Fuel-air explosives do not leave messy duds behind, but burn the lungs of anyone standing around.
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"In fact, when you burn coal, you emit more acid rain pollution, more air pollution, more smog and more global warming pollution which threatens the entire planet, " said Becker, global warming program director for the Sierra Club.
On the environmental side, when you burn these fossil fuels, you're really seeing carbon dioxide into the air.
The emissions, from what are known as "burn pits, " have been a concern for troops, especially those who served at Balad Air Force Base in Iraq.
If you look at across the whole life cycle of growing corn, making ethanol and burning it in a car, and compare that to what happens when you find oil and make gasoline and burn it in a car, you only have about 15 percent less greenhouse gas going into the air from burning ethanol than you would if you're burning gasoline.
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