at 10% light speed it'll take 90+years as for arriving from Sirius. at 1% light speed we're talking of said travel of perhaps 1000 years. Either of those are suggesting of one-way tickets, and I believe the fastest recorded substance (short of any supernovae associated flak) that has been recorded was 600 km/s, and obviously that's not even 1% light speed. Hopefully this is where your expertise input is going to help accomplish my understanding. I thereby have this somewhat mortal sub-light-speed question. Being that running yourself into even a mere 2 mg speck of something is going to be absolutely lethal at 3e8 m/s, how about we contemplate upon the notions of a more conservative 3e7 m/s (10% light speed), or just 3e6 as 1% light speed. Say once we get ourselves past a given nullification zone, such as 8% towards Sirius (that's merely 0.7 light year along the way), and being that the Sirius star system offers twice the mass of what all our solar system has to offer, what would be the energy requirement as to maintaining either 1% or 10% LS if the medium of said space were sufficiently slight in terms of atom count/m3. In other words, what's known about the terminal velocity of such space travel beyond such a given nullification zone? Of how much additional energy/m3 is it going to require as to exceeding that terminal velocity?