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John Lemke

Ask Ethan #55: Could a Manned Mission to Mars Abort? - Starts With A Bang! - Medium - 0 views

  • No humans have ever traveled farther away from Earth than the crew of Apollo 13 did, as they circled around the far side of the Moon close to lunar apogee, achieving a maximum distance of 400,171 km above the Earth’s surface on April 15, 1970. But when the first manned spaceflight to another planet occurs, that record will be shattered, and in a mere matter of days.
  • The way we currently reach other worlds with our present technology — or any remote location in the Universe — involves three distinct stages:The initial launch, which overcomes the Earth’s gravitational binding energy and starts our spacecraft off with a reasonably large (on the order of a few km/s) velocity relative to the Earth’s motion around the Sun.On-board course corrections, where very small amounts of thrust accelerate the spacecraft to its optimal trajectory.And gravity assists, where we use the gravitational properties of other planets in orbit around the Sun to change our spacecraft’s velocity, either increasing or decreasing its speed with every encounter.It’s through the combination of these three actions that we can reach any location — if we’re patient and we plan properly — with only our current rocket technology.
    • John Lemke
       
      How we can do it now, if we plan right.
  • The initial launch is a very hard part right now. It takes a tremendous amount of resources to overcome the Earth’s gravitational pull, to accelerate a significant amount of mass to the Earth’s escape velocity, and to raise it all the way up through the Earth’s atmosphere.
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  • The most optimal one for a one-way trip to Mars, for those of you wondering, that minimizes both flight time and the amount of energy needed, involves simply timing your launch right.
    • John Lemke
       
      The cheapest and the fastest. The one way ticket option.
  • When a planet orbits the Sun, there’s a lot of energy in that system, both gravitational energy and kinetic energy. When a third body interacts gravitationally as well, it can either gain some energy by stealing it from the Sun-planet system, or it can lose energy by giving it up to the Sun-planet system. The amount of energy performed by the spacecraft’s thrusters is often only 20% (or less) of the energy either gained-or-lost from the interaction!
    • John Lemke
       
      The transfer of energy involved to change speeds.
John Lemke

Robot hummingbird passes flight tests (w/ Video) - 0 views

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    The Hummingbird's bird-shaped body is removable but it gives the bot an uncanny resemblance to a real hummingbird. The vehicle can hover and maneuver just like the bird. The ornithopter can fly into buildings under the control of an operator flying the spybot with the help of a feed from its tiny video camera. The prototype is capable of flying at speeds of up to 18 km/h (11 mph) and weighs 19 grams, which is about the same as an AA battery.
John Lemke

Massachusetts Man Charged Criminally For Videotaping Cop... Despite Earlier Lawsuit Rej... - 0 views

  • You may remember a high-profile, landmark ruling last year in Massachusetts, where charges against Simon Glik -- arrested for violating a state law that said it's "wiretapping" to record a police officer in public without his permission -- weren't just dropped, but the arrest was found to be both a First and Fourth Amendment violation. In the end, Boston was forced to pay Glik $170,000 for violating his civil rights. You would think that story would spread across Massachusetts pretty quickly and law enforcement officials and local district attorneys would recognize that filing similar charges would be a certified bad idea. Not so, apparently, in the town of Shrewsbury. Irving J. Espinosa-Rodrigue was apparently arrested and charged under the very same statute after having a passenger in his car videotape a traffic stop for speeding, and then posting the video on YouTube. Once again, the "issue" is that Massachusetts is a "two-party consent" state, whereby an audio recording can't be done without first notifying the person being recorded, or its deemed a "wiretap." This interpretation, especially when dealing with cops in public, is flat-out ridiculous and unconstitutional, as the Glik ruling showed.
John Lemke

Inside NZ Police Megaupload files: US investigation began in 2010 | Ars Technica - 0 views

  • Further evidence of overeager and illegal police work emerged Thursday in New Zealand as Inspector General of Security and Intelligence Paul Neazor released a report on the illegal bugging of Kim Dotcom and Megaupload programmer Bram van der Kolk. Two GCSB officers were present at a police station nearby Dotcom’s mansion as the raid took place.
  • Police weighed several options for the raid named “Operation Debut,” undertaken at the behest of US authorities, and sought to take Dotcom and associates with the “greatest element of surprise” and to minimise any delays the in executing the search and seizure operation should the German file sharing tycoon’s staff be uncooperative or even resist officers on arrival.
  • The police planners also noted that “Dotcom will use violence against person’s [sic] and that he has several staff members who are willing to use violence at Dotcom’s bidding” after a U.S. cameraman, Jess Bushyhead, reported the Megaupload founder for assaulting him with his stomach after a dispute. Based on Dotcom’s license plates such as MAFIA, POLICE, STONED, GUILTY, and HACKER, police said this indicates the German “likes to think of himself as a gangster” and is “described as arrogant, flamboyant and having disregard for law enforcement.” However, the documents show that Dotcom had only been caught violating the speed limit in New Zealand. The request for assistance from the STG notes that the US investigation against Mega Media Group and Dotcom was started in March 2010 by prosecutors and the FBI. According to the documents, US prosecutors and FBI “discovered that the Mega Media Group had engaged in and facilitated criminal copyright infringement and money laundering on a massive scale around the world.” FBI in turn contacted NZ Police in “early 2011," requesting assistance with the Mega Media Group investigation as Dotcom had moved to New Zealand at the time.
John Lemke

Leaked Snowden documents detail NSA's plans for 'millions' of malware attacks | The Verge - 0 views

  • A program known as TURBINE, first revealed last year, is meant to dramatically speed the process: one document says it will "allow the current implant network to scale to large size (millions of implants) by creating a system that does automated control implants by groups instead of individually."
  • The scaling process, according to Greenwald, started in 2004, when the NSA operated only 100 to 150 software implants. The number of implants used in the years between 2010 to 2012, by contrast, is described as numbering in the tens of thousands.
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