/sci/ - Science & Math

>>9403965
I watched first 8 min. or so, then started skipping.
Talks about "how far we can go without FTL" and then segues smoothly over to "suppose we could cross the galaxy in a year." Every time I paused after that I saw clips from StarGate.

Suppose we had "perfect" fusion rockets. By which I mean no energy lost to neutrinos or waste heat. Suppose we wanted to attain HALF lightspeed, coast the majority of the trip, and then slow again. (Ignore the consequences of plowing through interstellar dust and gas.)
You need a mass-ratio over 300,000!!
A 1000 ton ship (small for a multi-decade voyage) would start out massing 300,000,000 tons. We're also assuming the tankage to hold all that fuel weighs nothing.