hello everyone, i wasn't sure what category this should go under so General Physics was the safest bet. to my understanding when antimatter and normal matter collides its a 100% conversion into light, is this correct? if so, the conservation of mass says all the mass that was originally there is still there but instead of few atoms of antimatter and matter it is now millions upon billions of photons, is that also right? if so, in the future, near or far i don;t know, could we perhaps have a controlled reaction between the two in a engine of sorts that then directs these photons in a single direction using mirrors to achieve space flight? using the momentum equation m1v1=m2v2 if we wanted to get one ton to achieve escape velocity (11,000 m/s) we would need 19 grams of antimatter and another 19 grams of matter. because 1000(a ton in kg)*11000(escape velocity)=3*108(speed of light / speed mass will be travelling after reaction)*0.0367(amount of mass needed to balance equation) there's definitely something im missing, i know its hard to create and store antimatter and even harder to make something which can do what im asking but i feel as if i would of heard something somewhere if a project like this was in development, there's got to be a reason why it isn't, any details or information on this would be great, thanks.