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Everything posted by Exploro

  1. I would be cautious about attempting to measure eclipse-induced changes to local barometric pressure. For starters the event itself is very brief; less than two or three minutes. While there might be a detectable changes in temperature that might not cause a significant change in local barometric pressure (or more to the point a detectable change). Furthermore; weather systems in your vicinity might actually be responsible for any changes in local barometric pressures you detect during your observations. As pressure systems, fronts, or upper levels troughs move with respect to a given location, the pressure also changes as a result. Thus an eclipse-induced change; if any, might be drowned out by the stronger effects of these weather systems; making it impossible to tell with absolute certainty that the changes you would observe throughout the time of the Moon's transit was actually produced by the Eclipse.
  2. It is possible to use the surface of the sail for flat-geometry antenna as proposed here. Thus it is conceivable to negate the need to physically alter the sail shape to be parabolic. Further as I understand AESA radars demonstrate the ability to steer a radar beam electronically. Thus is it possible to develope a technology that could allow a deep space vehicle's radio antenna to point it's beam at Earth without having to mechanically point the antenna or maneuver the craft to to point the antenna Earthward? Secondly I will point out that solar sail spacecraft IKAROS did not use winches to maintain shape nor use that for manuevering. Tip masses kept the sail unfurled as it spun and liquid crystals altered reflectivity to allow for steering. Granted IKAROS was not propelled by a laser; yet the principles that allow IKAROS to operate are the same that govern the operation of lightsail craft propelled by laser. Perhaps then a flight vehicle dispatched to Proxima or Alpha Centauri might look more like IKAROS as the mass of winches or other mechanical equipment as you describe are likely out of the question. Power is obviously another challenge. But I think once more you are limiting yourself by restricting the power generation system to just the small chip craft. Much as the sail could be used as an antenna is it possible to place photovoltaic elements onto the sunward (or rather starward in the case of a craft on approach to it's destination star) for power generation? And remember the proposed sail is 16 sq. meters in area.
  3. SN did lose out to SpaceX and Boeing for contracts to fly crewed missions to and from the ISS. However there was still plenty to go around for unmanned supply mission contracts; which SN secured in January of last year.
  4. A drone designed to operate within the Martian atmosphere would be using airfoils optimized for that environment. Of course to summarize a paper on martian airfoils by Akira Oyama; such aircraft would need an airfoil that was very thin and assumes the craft would need to operate at a speed of 2,000 kph. These are complications when designing such a craft but insurmountable. Of course a Martian exploration aircraft need not rely on using airfoils. A dirigible could be a suitable choice for Martian surveying as it can operate under it's own power without having to design a complex Martian-optimized airfoil and can do so at much lower airspeeds. Even a balloon could be used and one concept allows for the balloon to possess means to control it's path despite having no propulsion system. Additionally a martian drone can be; and likely would be, automated. A human is not required to actively control the craft beyond commanding it to fly to areas of interest. Thus the radio communication lag is irrelevant. And finally while dust storms would pose a hazard that can be surmounted too. Either the craft can actively avoid storms or a large number of drone aircraft could be operated simultaneously; lossing one or two to storms wouldn't impact the overall aerial surveying mission of the fleet as a whole (assuming such craft are cheap to develope and deploy).
  5. That fact alone that mankind can effect changes to an environment on a planetary scale show we could do so elsewhere; given time, resources, and will. Likewise means to reverse the deterimental effects are in the realm well within the technologically possible; the sequestration or the capturing of CO2 gases for instance. Obviously there is more to the global warming problem here on Earth that technology alone can't overcome but that is outside the scope of this discussion.
  6. In another image from Juno the blue cloud regions appear on the dayside of the Jupiter's southern pole. I think you might be right about the altitude of the clouds determining the color. Aside from chemical composition and temperature of the clouds the cloud height also plays a role in the color of the clouds. Back in August of 1996 Robert Nemiroff wrote a brief article on Astronomy Picture of the Day. In that he wrote that in warmer regions various compounds are brought up from the depths of Jupiter's atmosphere into high altitude. This chemical soup would obviously tint the clouds. Lower altitude clouds in the bands that surround the gas gaint appeared to be blue. If the poles of Jupiter are anything like the poles of Earth we could expect that polar subsidence would supress the kind of vertical cloud development we observe in the bands that encircle the gas giant. This might account for why the clouds of the poles are lower in altitude compared to the clouds in the bands.
  7. N. Korean nuclear weapons are thought to be far more massive than those used by other nuclear powers. The mass of the warhead for the Hwasong-10 for instance is about 1.5 metric tons. This more massive than the one used on the US Minuteman III which at most .8 metric tons and that system boasts MIRVs and a range 3 times as far as the Hwasong-10. It would make sense that if miniaturizing the warheads can't be accomplished it be easier to build a bigger missile.
  8. No. Though both programs were born out of the their respective military rocket programs both found existance outside of the development of ICBM technology. Presently the government of N. Korea seem interested in developing rocket technology soley for the purpose of developing an ICBM. For the near future there seems to be no serious consideration for fostering a indigenous civil space program.
  9. According to a quick wiki-read HBR Turbofans offer efficient performance up to mach 1.6. Further for supersonic transport flight a bypass ratio of .45 is considered "proper". To put into perspective, military LBR Turbofans like the F119; a pair of which powers the F-22, operate with bypass ratio of .30. Now I am aware that the Air Force is presently developing technologies under the ADVENT program; Adaptive Versatile Engine Technology, It would allow for a jet engine to be able to operate over a wide range of airspeeds and altitudes. In other words an engine derived from ADVENT could allow an aircraft to operate efficiency at low speed and low altitude much like a HBP turbofan and when at high speeds and high altitudes operate efficiently as a pure turbojet. ADVENT could find it's way into civilian powerplant systems. Which would allow a future SST to surmount that technological hurdle.
  10. That is an impressive sight. Out of curiousity was this viewed with unaided eyes or through optics like a telescope or binoculars?
  11. What you likey saw was the a flare from a geostationary satellite. Five or six years ago I recall seeing several similar occurrences while looking towards the constellation Leo in late spring. These short (lasting mere seconds) bright flashes usually about the same time; around 11:30 PM local time and occurred in the same place in the sky. These flashes looked nothing like shooting stars nor of satellites flying overhead. Flybys exhibit a gradual change in the magnitude as a spacecraft passes by; ranging from several seconds to sometime several minutes. But the flashes were extremely brief. Having also seen Iridium Flares before I knew these flashes were not quite the same; as Iridium Flares do have noticable motion to them; where as these aforementioned flashes were seemingly fixed. At the time I was unaware geostationary satellite flares occurred. Thus much like you I thought I was witnessing a star flaring up or some other naturally occurring process rather than a man-made one.
  12. Electrodynamic tether propulsion system would likely be what you want to use.
  13. For those interested here is a page that describes the abort modes for the Gemini.
  14. True all safety contigencies are viable under certain circumstances; outside of which such measures would fail or be of no use. That does not mean they exist only to give piece of mind. About 15 years ago or so I recall seeing a TV program on British Royal Navy submariner training. One escape method that was demonstarted in the program was the use of the Submarine Escape Immersion Equipment. It is water tight suit that supplied air to the submariner to breath and bouyancy to ascend. Further it helps prevent the onset of hypothermia. Lastly it would help the submariner stay afloat on the surface until help arrived. The suit is designed to keep a submariner alive from a depth of 600 feet. Obviously modern military submarines can go further down than that; 1200 feet or so. Thus that method of escape is only viable to a certain depth as you point out. But a mishap or accident at 600 feet can be just as perilious as one happening at 1200 feet. So even if SEIE is useful for limited regime, having that means of escape is still of tangiable benefit.
  15. Not all emergency modes would trigger LES to activate nor would LES be of help. A cabin emergency; say smoke in the cabin, would make using LES option useless. The only escape option would be immediate evacuation from the capsule and quick escape via the zip line.
  16. One could fly a DME arc into or out from the runway environment. The only problem of course would be the vertical guidance down to the runway environment in the case of landing. Further I would find establishing routes to clear terrain and other obstacles another incredibly difficult challenge to surmount.
  17. No Veeltch you're not. To me it is like a short episode of Planetes only in monochrome.
  18. Yeah that's my screw up. Confused Echostar 23 for SES-10.
  19. The reuse of the 1st stage is a milestone in of itself. Hopefully with the next upgrade to the Falcon 9 will allow for recovery from missions with similar parameters to tonights launch.
  20. I would have had you not already done so. 90% of my searches are accomplished by Duckduckgo.
  21. Last year I read "The Right Stuff". One part in particular noteworthy; as it was sadly ironic considering what lead to his death. Grissom was touring the Convair plant building the Atlas rockets to be used in the Mercury program. He tells the production team to "Do good work"; inspiring them to build flawless machines to ensure the safety of the astronauts that would ride atop them. When I read that I reflected on the flaws and faults found in the CM of the Apollo he and his two crewmates died within.
  22. It will be nice to see a launch from LC-39 again after eight years of being idle.
  23. Yes. That is true. Why the bombers diverted was not necessarily the point. My point to Darnok was that in a scenario where US forces did not announce news of the attacks; the world would still learn it was the US who had delivered the bombs as it was the only one of the Allies present in the skies at the time of the attacks. Sorry if I derailed the thread.
  24. That's a lousy example. Even had the US made no announcement after the attacks; the fact is the Japanese were aware of approach of US aircraft leading up to both attacks. In fact in the case of the bombing of Nagasaki; the Japanese had attempted to engage the three US bombers assigned to that mission after three unsuccessful runs on Kokura; the primary target of the Aug. 9th bombing. Therefore even had the US said nothing it would not have taken a genius to determine that US aircraft had initiated both attacks.
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