With today’s best propulsion technology, chemical rockets, it would take between 50 and a 100 millennia to reach Proxima Centauri, the nearest star to the Sun. The ideas we have about how to expedite such a journey are just that: ideas. They belong to the realm of speculation. Nonetheless, they are beginning to take on an empirical glow. To be sure, the bundle of technologies that could conceivably send a spacecraft to another star won’t be here within the decade, or even within several, but neither are those technologies mere magical realism — indeed, planning for their development has begun in earnest.