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spacex - Could a rocket first stage be rapidly reusable after landing . . . Landing a first stage rocket (F9R) in the ocean has been stated that it is corrosive and will damage rocket components, thus making rapid reusability impossible or too expensive to repair each component The other goals are to land on a barge or return to a launch pad on land
How is maintenance, repair and refueling done on satellites currently? The only other option would be having some orbital satellite-repairing satellite Which would have to be able to automatically diagnose and repair issues (and so again, doesn't exist), have all the tools and resources to do so, and somehow have enough fuel to dock with the satellite All of which is totally impractical
What damage repairs have to be done to the launch pad every time SpaceX . . . As SpaceX is a company that is very focused on rapid reusability, low-cost operation and a philosophy of "the best part is no part", what repairs have to be done to the towers and general pad complex at their various pads every time they launch and do not have a rapid unscheduled disassembly within the proximity of the tower?
Why were four Space Shuttle orbiters initially built? As projected development costs for the shuttle climbed, the only way for it to appear to be more cost-effective than expendable launcher options was if it flew a very high mission tempo, about one launch per week With such rapid turnaround times, four orbiters probably wouldn't have been enough, and more would have been ordered
First use of solid-state RAM (memory) in space? I spent a long time staring at the HSEM schematic because it wasn't working right and I wanted to use it for pulsars and other rapid variability I have no idea where to look for original sources I have a thick CDR-level design manual for the payload, but the HSEM was a later, hasty addition (not properly tested debugged :-(
Are astronauts permitted to listen to music during their daily exercise? I have no idea how they would be forbidden from listening to music while exercising; there is also explicit reference in astronauts' journals to listening to music while exercising on the ISS, documented (but anonymized) by Stuster in NASA TM-2016-218603
Are satellite repairs in orbit still being performed nowadays? There are two major factors you need to make a repair mission possible: The Shuttle showed that on-orbit repairs become much easier if you can attach the satellite to the spacecraft, and if the spacecraft has a manipulator arm
Why doesnt SpaceX use solid rocket fuel? SpaceX in particular has developed their rockets around reuse via powered landing, and solids are completely unsuited to that; you need rapid, precise throttling of thrust to do a SpaceX style landing SpaceX's economics also depend on economies of scale, using the same engines in first and second stages
Could they free up a docking port on ISS by undocking the emergency . . . $\begingroup$ @MarkMorganLloyd Doesn't really matter If one of your lifeboat capsules was out on the end of an arm or floating autonomously, the evacuation procedure in case of an emergency suddenly goes from a few minutes of "everyone go to your assigned hatch and get in" to a complicated process of launching one lifeboat, then maneuvering the second capsule to that dock and securing it