this is seminal. the most inspirational thing you'll watch this year.

we can go to mars in our lifetimes.

For immigrants, who will spend the rest of their lives on Mars, or even explorers who would spend 2.5 years on a round trip, the advantage of reaching Mars one-way in 4 months instead of 6 months is negligible — and if shaving off 2 months would require a reduction in payload, meaning fewer provisions could be brought along, then the faster trip would be downright undesirable.