kerbiloid Posted February 5, 2019 Share Posted February 5, 2019 (edited) 1 hour ago, KG3 said: Explosive bolts... ...a technician with a torque wrench very carefully tightening a nut, hoping he doesn't loose any fingers! He shoots. Spoiler P.S,https://www.reddit.com/r/space/comments/57ux0w/space_shuttle_hold_down_post_nuts_that_are_split/ https://www.practicalmachinist.com/vb/antique-machinery-and-history/pyrotechnic-fasteners-part-one-313929/ Edited February 5, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
KG3 Posted February 5, 2019 Share Posted February 5, 2019 2 hours ago, Xd the great said: No. NO. This is not KSP. Ok, sorry. Pyrotechnic fasteners. Quote Link to comment Share on other sites More sharing options...
DDE Posted February 5, 2019 Share Posted February 5, 2019 (edited) 4 hours ago, KG3 said: Are they anything like the bolts I might see at a hardware store? In a way. Certain non-space-grade designs use blank shotgun cartridges or somesuch to pop the bolt. Edited February 5, 2019 by DDE Quote Link to comment Share on other sites More sharing options...
magnemoe Posted February 6, 2019 Share Posted February 6, 2019 20 hours ago, DDE said: In a way. Certain non-space-grade designs use blank shotgun cartridges or somesuch to pop the bolt. Where is this used? Pyrotechnic fasteners are used on fighter jets to release drop tanks or larger bombs / rockets. Know that some cranes on oil platforms has an pyrotechnic wire cutter who cut the wire if the crane is about to tip over. Its an risk that the wire or cargo get stuck on an boat while unloading. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 6, 2019 Share Posted February 6, 2019 (edited) And the pilot helmets - to close the glass filter.https://ru.wikipedia.org/wiki/Авиационный_шлем Spoiler Edited February 6, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
<Joseph kerman> Posted February 8, 2019 Share Posted February 8, 2019 Is dark matter regular matter just moving backwards in time Quote Link to comment Share on other sites More sharing options...
Xd the great Posted February 8, 2019 Share Posted February 8, 2019 52 minutes ago, <Joseph kerman> said: Is dark matter regular matter just moving backwards in time Probably not, as EM will interfere with them. Quote Link to comment Share on other sites More sharing options...
p1t1o Posted February 8, 2019 Share Posted February 8, 2019 (edited) 11 hours ago, said: Is dark matter regular matter just moving backwards in time Welcome to the forums! Dark matter is still a mystery. We know very few things about it. We know that it has mass and that it exerts a gravitational field based on its mass, the same way normal matter does. But it does not interact with normal matter in any other way (that we currently know of.) It is invisible, EM radiation is not impeded by it in any way. You cant touch it, it passes through normal matter, and vice versa, completely without resistance. There is dark matter in the room with you now, although it is very diffuse. There is estimated to be approximately 1 protons-worth of mass of dark matter per 2-3 cm3, within our solar system. One interesting hypothesis (note - unproven/lack of data, competes with other hypotheses) is that dark matter is normal matter that exists in other universes. Some advanced physics concepts describe how fields (eg: magnetic, electric) cannot pass between, or influence at all, other universes - except for gravity, which may be able to be felt across universes, and this is how we are detecting "dark matter". This would explain many of its strange properties, for example that you cannot see or touch it. **edit** Further note - if gravity can propagate across universes, this opens up the possibility of communication with other universes... **edit#2** Furtherfurther note - the "leaking" of gravity between universes has also been postulated to explain why gravity is so weak, compared to the other universal forces (eg: electromagnetism). Edited February 8, 2019 by p1t1o Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 8, 2019 Share Posted February 8, 2019 (edited) 3 hours ago, p1t1o said: (dark matter) We know that it has mass and that it exerts a gravitational field based on its mass, the same way normal matter does. As we can see that the gravitational field (usually based on some mass) is exerted, we presume that there is some kind of matter gravitationally acting like a normal mass, lol. 3 hours ago, p1t1o said: if gravity can propagate across universes, this opens up the possibility of communication with other universes... And this really inspires! Spoiler Edited February 8, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
wumpus Posted February 9, 2019 Share Posted February 9, 2019 On 2/7/2019 at 11:24 PM, <Joseph kerman> said: Is dark matter regular matter just moving backwards in time Antimatter fits [all?] the equations as if it was running backwards in time, but I believe enough antimatter has been observed to show it increases in entropy (the one bit of physics that definitely shows the direction of time). There's little reason to believe that dark matter would be anything like that. Quote Link to comment Share on other sites More sharing options...
magnemoe Posted February 11, 2019 Share Posted February 11, 2019 On 2/9/2019 at 5:44 PM, wumpus said: Antimatter fits [all?] the equations as if it was running backwards in time, but I believe enough antimatter has been observed to show it increases in entropy (the one bit of physics that definitely shows the direction of time). There's little reason to believe that dark matter would be anything like that. Antimatter is not dark matter, one of the key features with dark matter is that it interact very little with normal matter outside of gravity. The remarkable thing with antimatter is how violently it react to normal matter Something like neutrinos fit better, no don't thin normal neutrinos will work but they are an good template. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 11, 2019 Share Posted February 11, 2019 What if dark matter annihilates with dark antimatter? Quote Link to comment Share on other sites More sharing options...
Xd the great Posted February 11, 2019 Share Posted February 11, 2019 19 minutes ago, kerbiloid said: What if dark matter annihilates with dark antimatter? KABOOM Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 11, 2019 Share Posted February 11, 2019 Just now, Xd the great said: KABOOM Yes, but visible or dark? Quote Link to comment Share on other sites More sharing options...
Xd the great Posted February 11, 2019 Share Posted February 11, 2019 38 minutes ago, kerbiloid said: Yes, but visible or dark? Dark energy..? Also blows stuff away. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 11, 2019 Share Posted February 11, 2019 4 minutes ago, Xd the great said: Also blows stuff away. Maybe just pulls with gravity Quote Link to comment Share on other sites More sharing options...
Racescort666 Posted February 11, 2019 Share Posted February 11, 2019 (edited) @kerbiloid @Xd the great regarding dark matter and dark anti-matter annihilation. Spoiler Edited February 11, 2019 by Racescort666 Kerbal died, reverted to VAB Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 11, 2019 Share Posted February 11, 2019 (edited) Every time when somebody mentions worthy @Kerbaloid instead of me, one Kerbal dies. Upd. And even if later they correct the summoning spell, that Kerbal is anyway gone. Edited February 11, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted February 11, 2019 Share Posted February 11, 2019 2 hours ago, Racescort666 said: @kerbiloid @Xd the great regarding dark matter and dark anti-matter annihilation. Hide contents And it releases some incredibly dark anti-gamma rays? Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 11, 2019 Share Posted February 11, 2019 3 minutes ago, StrandedonEarth said: And it releases some incredibly dark anti-gamma rays? Who knows... Maybe the rays of darkness. Quote Link to comment Share on other sites More sharing options...
tater Posted February 15, 2019 Share Posted February 15, 2019 Quote Link to comment Share on other sites More sharing options...
Silavite Posted February 22, 2019 Share Posted February 22, 2019 (Paging @ProtoJeb21) I'm working on a very simple model for the atmosphere of an exoplanet, and I'm a bit stuck. I understand that it is possible to find scale height and the composition of an exoplanet's atmosphere. It should be possible to roughly find the planet's average temperature from the parent star's irradiance at the distance of the exoplanet. Is it possible to get an absolute value for density or pressure at an altitude from direct observation and thus create a rudimentary atmospheric model? (Assuming a very simplistic single layer atmosphere). Quote Link to comment Share on other sites More sharing options...
ARS Posted February 22, 2019 Share Posted February 22, 2019 How exactly the G-suit works for pilot? Does it reduce the G-force effect on the pilot or what? Quote Link to comment Share on other sites More sharing options...
Xd the great Posted February 22, 2019 Share Posted February 22, 2019 1 hour ago, ARS said: How exactly the G-suit works for pilot? Does it reduce the G-force effect on the pilot or what? It keeps fluids in the body, aka blood, at the heads of the pilot so they dont pass out, I beleive. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 22, 2019 Share Posted February 22, 2019 (edited) Oxygen flows through the rubber pipes and inflates rubber chambers applying to the parts of body the required pressure. The chambers inflate/deflate, fibers around the parts of body strangle/unstrangle. Spoiler The pressure compensates the attempts of the blood to offset due to the accelerations, and the low pressure in case of the cabin decompression. (The suit is attached to the breath system of the seat and cabin) Edited February 22, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
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