The Comet HLLV was a proposed super heavy-lift launch vehicle designed for NASA's First Lunar Outpost program, which was in the design phase from 1992...

the nuclear engines, along with all Saturn V ELVs, ended in 1973. The Comet HLLV was a massive heavy lift launch vehicle designed for the First Lunar Outpost...

2013[update], none have proceeded beyond the initial study phase. The Comet HLLV would have used five F-1A engines on the main core and two on each of...

relied on a massive Saturn-derived launch vehicle known as the Comet HLLV. The Comet would have been capable of injecting 230.8 t (508,800 lb) into low...

powering the Space Shuttle in a number of early designs as well as on the Comet HLLV. While work on the J-2S continued, NASA also funded a design effort to...

have relied on a massive Saturn-derived launch vehicle known as the Comet. The Comet would have been capable of injecting 254.4 tons into low Earth orbit...