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Politically motivated dates that do not conform to schedule reality for the various elements of NASA’s moon plan have become a staple of the program, as NASA continued to publicly maintain — until a few months ago — that SLS would fly its first mission just before the Presidential election of 2020 even when their own public meetings all conclusively showed no ability for the rocket to meet that date for several months prior to the agency finally admitting it
One thing that did not change with the decision to co-manifest HALO and PPE is the module’s overall internal habitable volume. HALO itself is derived from the Cygnus cargo transportation vehicle and will have the same diameter as Cygnus (3.07 m) while being 6.1 m long — one meter longer than Cygnus — to meet habitable volume needs for future Gateway crews
“The way NASA has it envisioned is that we’ll both meet at the launch site and integrate [there]. Generally, you want to give yourself a month and a half or so of integrated operations before you start operations with the launch vehicle, so you might show up several months before launch. Like three or four.â€
SpaceX render of its Dragon XL vehicle for Lunar Gateway resupply
Internal NASA documents have already revealed that the Falcon Heavy from SpaceX is the launch vehicle for the mission, though when the agency will choose to make a formal announcement is unknown
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