Antimatter is defined by a negative baryon or lepton number, opposite to the positive numbers of normal matter. When antimatter and matter interact they mutually annihilate on another, unleashing energy while generating photons and gamma rays. The annihilation would also produce thermal energy which could be used to heat water and then use the steam to turn a turbine, similar to a nuclear reactor. Using antimatter reactors to generate energy has its advantages, but the consequences of the action outweigh the gains. The problems with this reactor are: the cost of the creation of the particles, containment of the particles, transport of the particles and the consequences of a meltdown.A baryon is a subatomic particle made of three quarks that is subject to a strong nuclear force, while a lepton is any group of particles that are subject to a weak nuclear force and have a spin quantum number of ½, for example: electrons and neutrinos. Both antimatter and matter are defined by their baryon or lepton numbers, with the numbers being equal on two particles but with opposite charges. In a reaction between the two, both the antimatter and matter particles are completely annihilated, with no byproducts. This makes antimatter reactors completely environmentally friendly.The Cost of creating antimatter (as of 1999) was $62.5 trillion for a gram and $1.25 quadrillion an ounce, with a percent efficiency of 50%, using machines at NASA. The price of antimatter in 2006 was estimated at $250 million per milligram ($25 billion per gram) by Gerald Smith. The expense of creating any substantial amount of antimatter basically negates any possibility of a reactor being built as the cost of a project often influences its success. Antimatter is impossible to contain and stabilize for any amount of time long enough to transport from a lab to a reactor facility, unless they are immediately next to each other. The record for the longest containment of antimatter is about 16 minutes at CERN in Geneva, Switzerland. The antihydrogen atoms created were able to settle into their ground state, which is the most stable state a particle or atom can be in until annihilating themselves. Transport of the Antimatter is impossible as it can only be contained in containers not made of matter (as the container would annihilate itself on contact). The best container for antimatter is a penning trap, which is a device that uses electrical and magnetic fields to hold charged particles and antiparticles isolated in place. The meltdown of a nuclear reactor scatters radioactive particles across kilometres while an antimatter reactor could just destroy the planet. An antimatter reactor would work by colliding matter and antimatter to create heat which would then boil water to turn a turbine which would create electrical energy. The only problem is that the complete annihilation of two particles would unleash an abundance of energy. If enough matter was converted to energy ( in this case, exactly 2 kilograms) it would produce 1.8*10^17 joules of energy, more than enough to destroy a planet the size of earth. Not only that but it would produce an insane amount of gamma radiation and provide fireworks for anyone living in the Proxima Centauri star system (approx. 4 light-years away).