Fusion, on Earth and in space
In December 2022, Lawrence Livermore's National Ignition Facility crossed scientific breakeven: 3.15 MJ out from 2.05 MJ in. Private fusion (Helion, Commonwealth, TAE) now targets grid power in the 2030s. In space, fusion propulsion offers specific impulses of 10,000+ seconds — enough to reach Mars in weeks, not months.