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most recent 30 from space.stackexchange.com
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Is PVDF film still the practical choice for CubeSat-scale hypervelocity impact detection in 2025–2026, or have newer alternatives emerged?
Published: December 1, 2025 16:19
I am developing a ram-facing impact-sensing panel for a 2U CubeSat (≈100 × 200 mm exposed area) intended to detect and localize sub-mm to mm orbital debris / micrometeoroids in LEO (400–500 km). The current design uses 28–52 µm PVDF film with sputtered…
Deluge system refresh rates
https://space.stackexchange.com/questions/15130/deluge-system-refresh-rates
Published: November 30, 2025 22:09
SpaceX has said they will take the recovered CRS-8 Falcon 9 first stage and test fire it 10 times at LC-39A. There is lots of discussion as to what that means. 10 full 2+ minute duration fires? 10 3 second test fires? One after another? Days apart? NASA…
Did Apollo 13 CM reach thermal equilibrium when it was powered down?
Published: November 30, 2025 17:15
It was reported that the CM cabin temperature dropped to 43°F. Was that the equilibrium, or would it have gotten colder if it had remained in space longer. If that wasn't equilibrium was there an estimate of the cabin temperature the CM would have been,…
Could a tank of water under the launch pad be used instead of a flame trench?
Published: November 30, 2025 17:12
A flame trench is a massive expensive thing that needs constant repair. After each launch, concrete and steel suffer cracks, chips, melting etc., and require expensive, time consuming repair. Would it be feasible to instead use a huge pool of seawater? The…
Do the launch pads at Canaveral use fresh water, seawater, or what?
Published: November 30, 2025 16:49
Do they use chlorinated drinking water, fresh water from the ecology lake that separates the Cape from the mainland, or what?
Did the Apollo CM cooling unit use ethylene glycol or propylene glycol? [duplicate]
Published: November 30, 2025 07:42
Photo: NASA I assume they'd use ethylene glycol because that's what they use in cars. It must be more efficient, or they wouldn't use it in cars because it's poisonous. Propylene glycol is in my Italian dressing.
Could electrified circuitry etched on a circuit board have a notable affect as an electrodynamic thruster?
Published: November 29, 2025 21:10
Could circuitry on a circuitry board, say in a spiral as a solenoid once Electrified have a noticeable effect as a thruster? Since we're within the Earth's magnetic field electrodynamic tethers can be used to generate thrust or energy depending on if they…
Can astronauts in ISS and Tian Gong ever see each other's space stations?
Published: November 29, 2025 12:42
Can astronauts in ISS and Tian Gong (天宫) space station some times see each other space station? I guess these space station's orbits cross 2 time every orbit. Most times both stations don't reach cross points at same time, but sometimes maybe both stations…
Can sone times astronauts in ISS and Tian Gong space station see each others space stations?
Published: November 29, 2025 11:36
Can astronauts in ISS and Tian Gong (天宫) space station some times see each other space station? I guess space station orbits cross 2 time every orbit. Many times both stations never pass 2 cross points in same time but sometime may be both stations should…
Did Sagan's wife have a copyright and make money on the voyager Golden Record?
Published: November 29, 2025 09:45
I think I remember Ann Druyan — who also wrote Contact — had assembled the Voyager Golden Record, copyrighted it, and was making money off of it. But Alexa says that's not true. So which is it? Was that just an urban legend?
SpaceX Starship LOX tank autogenous pressurization icing fixed on Raptor V3?
Published: November 26, 2025 13:22
During Tim Dodd's interview with Elon Musk in 2023, Musk stated that the autogenous pressurization of the LOX tank was achieved with a feed from the oxygen side turbopump introducing small amounts of steam and carbon dioxide into the tank as well. These…
Using collisions between projectile and interstellar asteroid for propulsion
Published: November 26, 2025 12:42
There have been proposals for harnessing nuclear explosions for interstellar spacecraft propulsion (nuclear pulse propulsion). Rather than harnessing nuclear explosions, has the possibility of deliberately colliding impactor projectiles with small…
How do cyclers deal with discreapncies in orbital inclinations and the fact that only Neptune and Pluto are in true orbital resonance?
Published: November 26, 2025 00:01
Cyclers work by taking advantage of alignments in planets' orbits, but since coincidental "resonances" do have slight variations, they require regular corrections; how would you calculate the required orbital period of a cycler so that it regularly passes…
Space craft travel between space stations?
https://space.stackexchange.com/questions/70127/space-craft-travel-between-space-stations
Published: November 25, 2025 14:11
Would it be possible for one of the spacecraft that are currently docked to the ISS to undock and, before returning to Earth, change orbit and align with the Tiangong Space Station — or vice versa? I know they can most likely not dock, so the goal is…