Bill Phil Posted April 18, 2019 Share Posted April 18, 2019 7 minutes ago, ARS said: What's the single heaviest payload ever brought to orbit? And what's the single heaviest possible payload that we can launch today? Single heaviest? If you count the Shuttle Orbiter as payload (and it kind of is...) then the Shuttle Orbiter. Beyond that, probably Skylab. Unless we count propellant, in which case the Saturn V’s S-IVb with Apollo Command and Service Module plus lander. Today? Probably Proton’s max capacity, I think. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted April 18, 2019 Share Posted April 18, 2019 (edited) Saturn IVB + Apollo ~150 t. Afaik, Falcon Heavy can lift moar than Proton. (twice?) Edited April 18, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
ARS Posted April 19, 2019 Share Posted April 19, 2019 2 hours ago, Bill Phil said: Single heaviest 1 hour ago, kerbiloid said: Saturn IVB + Apollo ~150 t What about non-crewed, non-propellant payload? Like satellites, probes or space station parts? Quote Link to comment Share on other sites More sharing options...
Bill Phil Posted April 19, 2019 Share Posted April 19, 2019 6 minutes ago, ARS said: What about non-crewed, non-propellant payload? Like satellites, probes or space station parts? Probably Skylab. Quote Link to comment Share on other sites More sharing options...
Bill Phil Posted April 19, 2019 Share Posted April 19, 2019 4 hours ago, kerbiloid said: Saturn IVB + Apollo ~150 t. Afaik, Falcon Heavy can lift moar than Proton. (twice?) Most of Falcon Heavy’s up-mass propellant, not payload. It’s currently unproven how much payload it can launch into LEO, depending on limitations of the payload mount, it can be less than Proton. Quote Link to comment Share on other sites More sharing options...
ARS Posted April 21, 2019 Share Posted April 21, 2019 How much Delta-V needed to change the orbit of Phobos into suborbital trajectory (or at least aerobraking altitude) on Mars? Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted April 21, 2019 Share Posted April 21, 2019 (edited) 22 minutes ago, ARS said: How much Delta-V needed to change the orbit of Phobos into suborbital trajectory (or at least aerobraking altitude) on Mars? According to , less than 1 km/s. 700 m/s - to LMO ? (for Earth - 100..150 m/s) to touch the air. Edited April 21, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
magnemoe Posted April 21, 2019 Share Posted April 21, 2019 On 4/19/2019 at 4:15 AM, Bill Phil said: Most of Falcon Heavy’s up-mass propellant, not payload. It’s currently unproven how much payload it can launch into LEO, depending on limitations of the payload mount, it can be less than Proton. Fairing size is more of an practical issue, you can easy make custom payload mounts and many payloads use that. Yes its an structural limit on the mass the upper stage can handle but you could reduce the maximum g force by shutting down some core stage engines before burn out. Quote Link to comment Share on other sites More sharing options...
Gargamel Posted April 21, 2019 Share Posted April 21, 2019 8 hours ago, ARS said: How much Delta-V needed to change the orbit of Phobos into suborbital trajectory (or at least aerobraking altitude) on Mars? The questions you routinely ask make me wonder if you need to be placed on a super villain watch list or something. I would think (as shown above) the dv calculations would be fairly trivial. What is not trivial is figuring out a way to expend enough energy to move that mass that much. Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted April 22, 2019 Share Posted April 22, 2019 1 hour ago, Gargamel said: I would think (as shown above) the dv calculations would be fairly trivial. What is not trivial is figuring out a way to expend enough energy to move that mass that much. In-situ mining of ice in tubes, electrolyzed into propellants, using the tubes/boreholes as thrust chambers. Possibly also using a laser-pumped fusion drive. At least, that’s how they did it in one trilogy novel Quote Link to comment Share on other sites More sharing options...
ARS Posted April 22, 2019 Share Posted April 22, 2019 (edited) 2 hours ago, Gargamel said: The questions you routinely ask make me wonder if you need to be placed on a super villain watch list or something. Nah, nothing serious here. Just a pair of AIs that grows beyond their programming Though to be honest what was crossing in your mind when the last 3 questions that I ask is about unauthorized space launch, heaviest possible payload to orbit and deorbiting Phobos? Edited April 22, 2019 by ARS Quote Link to comment Share on other sites More sharing options...
Shpaget Posted April 22, 2019 Share Posted April 22, 2019 Is it known what is canon regarding the speed of subspace communications in Star Trek universe? My google-fu is failing me. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted April 22, 2019 Share Posted April 22, 2019 https://scifi.stackexchange.com/questions/19725/how-does-star-trek-faster-than-light-communication-work Quote Link to comment Share on other sites More sharing options...
Shpaget Posted April 22, 2019 Share Posted April 22, 2019 That's exactly what I was looking for! Thanks. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted April 24, 2019 Share Posted April 24, 2019 (edited) Not a question, but just some list of sci-fi spaceships with pictures. https://www.denofgeek.com/movies/286589/top_75_spaceships_in_movies_and_tv.html https://www.denofgeek.com/movies/287096/top_75_spaceships_in_movies_and_tv_part_2.html https://www.denofgeek.com/movies/287101/top_75_spaceships_in_movies_and_tv_part_3.html https://www.denofgeek.com/movies/14627/top-75-spaceships-in-movies-and-tv-part-4 etc. Edited April 24, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
Racescort666 Posted April 24, 2019 Share Posted April 24, 2019 6 hours ago, kerbiloid said: Not a question, but just some list of sci-fi spaceships with pictures. https://www.denofgeek.com/movies/286589/top_75_spaceships_in_movies_and_tv.html https://www.denofgeek.com/movies/287096/top_75_spaceships_in_movies_and_tv_part_2.html https://www.denofgeek.com/movies/287101/top_75_spaceships_in_movies_and_tv_part_3.html https://www.denofgeek.com/movies/14627/top-75-spaceships-in-movies-and-tv-part-4 etc. Various other ships from BSG but Galactica is not on the list. Quote Link to comment Share on other sites More sharing options...
Mikki Posted April 24, 2019 Share Posted April 24, 2019 Random noob questions: 1. Do two photons with perfectly equal properties (eV, phase, wavelength etc,) annihilate each other when they meet "Head on" perfectly perpendicular in a vacuum? Or do they propagate further without any interaction? 2. Since photons are estimated without restmass and live around three years in their own referenceframe (or 1018 years for us simple observers), what causes their final (assumed) decay? To what do they decay? Neutrinos (With tiny mass and fast as hell?) ??? Quote Link to comment Share on other sites More sharing options...
Aegolius13 Posted April 25, 2019 Share Posted April 25, 2019 Has there been any public information about the ultimate cost allocation for the failed* Zuma spy satellite? I.e., whether Northrop and/or their insurers have to return some of the funds or make another one at their cost? All I could find was some early coverage predicting the U.S. government would just eat the cost, which seems troubling. *Queue the conspiracy theories that it's working fine, and Northrop agreed to take a bunch of verbal abuse in exchange for all that money. Quote Link to comment Share on other sites More sharing options...
Mad Rocket Scientist Posted April 25, 2019 Share Posted April 25, 2019 16 hours ago, kerbiloid said: Not a question, but just some list of sci-fi spaceships with pictures. https://www.denofgeek.com/movies/286589/top_75_spaceships_in_movies_and_tv.html https://www.denofgeek.com/movies/287096/top_75_spaceships_in_movies_and_tv_part_2.html https://www.denofgeek.com/movies/287101/top_75_spaceships_in_movies_and_tv_part_3.html https://www.denofgeek.com/movies/14627/top-75-spaceships-in-movies-and-tv-part-4 etc. The first one on that list, the Friede, is the ship in my avatar. Quote Link to comment Share on other sites More sharing options...
DDE Posted April 26, 2019 Share Posted April 26, 2019 On 4/22/2019 at 2:43 AM, Gargamel said: The questions you routinely ask make me wonder if you need to be placed on a super villain watch list or something. Just pick the top thirty or so posters for this subforum. Also, ran out of likes for the first time ever. Quote Link to comment Share on other sites More sharing options...
p1t1o Posted April 26, 2019 Share Posted April 26, 2019 You dont need to worry about the guy asking how to blow up the world - that guy doesnt know how to do it yet. Watch the people giving the answers Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted April 27, 2019 Share Posted April 27, 2019 Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted April 28, 2019 Share Posted April 28, 2019 This would probably fall victim to the rocket equation and/or simple TWR budget, but, how much would a space-rated fission reactor have to mass to power a laser-initiated, inertial confinement pulsed-fusion rocket engine? I suppose the mass would be less of an issue if it was not used for the initial launch, just for in-space use. Quote Link to comment Share on other sites More sharing options...
Brownie352 Posted April 28, 2019 Share Posted April 28, 2019 Are there any current Concepts or in development spacecraft to land people to mars and return them to earth? Quote Link to comment Share on other sites More sharing options...
Gargamel Posted April 29, 2019 Share Posted April 29, 2019 1 hour ago, Brownie352 said: Are there any current Concepts or in development spacecraft to land people to mars and return them to earth? Yes. We have a number of threads on the various launch agencies out there who are already working on the problem. I'd take a gander at some of those, as they would be more fitting for this type of discussion, rather than 'simple' question and answer format this thread tends to follow. Quote Link to comment Share on other sites More sharing options...
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