We have a number! Around 0.1c maximum and unsurprisingly it involves using nuclear bombs to push yourself. https://en.wikipedia.org/wiki/Project_Orion_(nuclear

We have a number! Around 0.1c maximum and unsurprisingly it involves using nuclear bombs to push yourself. https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion) https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propuls...