Oh and I forgot to mention, notice how I say we need to throw something with "momentum" and not "mass", this is because think of photons, they don't have a res

Oh and I forgot to mention, notice how I say we need to throw something with "momentum" and not "mass", this is because think of photons, they don't have a rest mass, but they have momentum! and all you need to makes photons is energy (Afterall LEDs do it with efficiently). Infact light sails [1] use this momentum to propel themselves forward! Afterall the solar system is full of photons thanks to the sun. The downside is... they are very very slow. There are also concepts of making a "Photon Rocket" [2] as a viable means of interstellar travel. [1]. https://en.wikipedia.org/wiki/Solar_sail https://en.wikipedia.org/wiki/Solar_sail [2]. https://en.wikipedia.org/wiki/Photon_rocket https://en.wikipedia.org/wiki/Photon_rocket [2].