An antimatter spaceship for Mars?
| If you're a science fiction reader, you know that spaceships are using antimatter to travel through space. Now NASA is working on such a spaceship to go to Mars in 45 days using only 10 milligrams of anti-electrons — or positrons — for the round trip mission. These positrons will emit gamma rays with about 400 times less energy than the ones emitted by antiprotons used in previous designs. Such a rocket would be much safer because it would reduce the time to travel to Mars and because there should be no leftover radiation after the fuel is used. There are still some remaining issues, such as the cost — $250 million for 10 milligrams — and the storage of antimatter which would have to be contained with electric and magnetic fields. But it's permitted to dream, isn't? If such a small quantity of antimatter can propel a spaceship to Mars — and even further — why hasn't been tried before? In reality this power comes with a price. Some antimatter reactions produce blasts of high energy gamma rays. Gamma rays are like X-rays on steroids. They penetrate matter and break apart molecules in cells, so they are not healthy to be around. High-energy gamma rays can also make the engines radioactive by fragmenting atoms of the engine material. The NASA Institute for Advanced Concepts (NIAC) is funding a team of researchers working on a new design for an antimatter-powered spaceship that avoids this nasty side effect by producing gamma rays with much lower energy. Antimatter is sometimes called the mirror image of normal matter because while it looks just like ordinary matter, some properties are reversed. For example, normal electrons, the familiar particles that carry electric current in everything from cell phones to plasma TVs, have a negative electric charge. Anti-electrons have a positive charge, so scientists dubbed them "positrons". When antimatter meets matter, both annihilate in a flash of energy. This complete conversion to energy is what makes antimatter so powerful. Even the nuclear reactions that power atomic bombs come in a distant second, with only about three percent of their mass converted to energy. Read more at NASA & Ermerging Technology Trends This was seized 4 u at Roland Piquepaille's post at ZDNet's Ermerging Technology Trends & NASA |
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