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johannessimon81

Through a glass, darkly: Chinese, American, and Russian anti-satellite testing in space - 2 views

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    Article mainly on anti-satellite testing by the Chinese and on US and Russian tests (2nd page) - quite extensive and technical but interesting
johannessimon81

Iridium to introduce WiFi hotspots for global satelite internet - 2 views

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    In remote / under-developed regions this might actually be a strong alternative for building internet connectivity - somewhat like the exploding market for cell phones in Africa due to the lack of land lines.
Thijs Versloot

Light-weight membrane optics test for building large telescopes in space #DARPA - 1 views

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    Using light-weight membranes to build telescopes in space it may be possible to one day image the whole planet completely at high resolution, hence also the interest of darpa.
johannessimon81

Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector - 1 views

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    IceCube detects a neutrino in about every 6 minutes but most are from within the solar system. A small number of very high energy neutrinos have been found though which have energies that cannot be produced by the sun or on Earth.
Thijs Versloot

Final design phase for worlds largest radio telescope #SKA - 0 views

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    One of the feats: "The SKA will be so sensitive that it will be able to detect an airport radar on a planet tens of light years away"
Dario Izzo

Modular Mobile Phones (big G + Motorola behind this): Same idea applicable to satellite... - 1 views

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    We thought about a modular SAT concept in tahe past (looking to the second issue of Acta Futura its already there) .... but never made concrete steps ....
johannessimon81

RT @JustBe74: China Unveils Its First and Unnamed Moon Rover - 0 views

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    Found this on Twitter ;-) This is also a test to see if Diigo titles get processed correctly as re-tweets...
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    Yes. Worked.
Beniamino Abis

Snake Robots for Exploration - 1 views

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    The researchers are busy working on a feasibility study assigned to them by the ESA. The idea is that by combining a rover that can navigate over large distances with a snake robot that can crawl along the ground and can get into inaccessible places, so many more possibilities could be opened up, e.g. collecting samples from tight spots that the rovers cannot reach.
johannessimon81

Update on Mars One - 2 views

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    165000 people have applied and the founders of Mars One still seem enthusiastic. Wouldn't it be great if they actually could pull it off..?
johannessimon81

NASA Fires Up Rocket Engine Made of 3-D Printed Parts - 0 views

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    I remember that ESA was looking into similar things for the Vulcain 2/2+ NE upgrade together with Volvo and other companies. Does anybody know about the status of that program (google does not ;-))?
johannessimon81

Physicists Succeed in Making 'Impossible' Gamma-Ray Lens - 0 views

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    High energy gamma rays are shown to be bent slightly by specialized lenses. The effect is likely due to pair-creation close to the atomic nuclei in the material.
Ma Ru

Cassini's Pale Blue Dot - 2 views

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    Earth, as seen from Saturn...
Daniel Hennes

CubeSat Ambipolar Thruster - 2 views

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    "Cast your name into deep space in style!"
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    Interesting approach, but with 99.9% probability they will miserably fail (at least in terms of their time schedule) simply because the technology is untested. I haven't read the refs (which miss by the way important works of E. Ahedo et al. on magnetic nozzle acceleration by ambipolar effects), but
    1. using water means that you produce oxygen radicals which will erode chamber walls (ionisation efficiency is not 100% and experimental tests haven't been performed yet).
    2. Electronic excitation (and radiation), rotational excitation, vibrational excitation, and dissociation are all processes which consume energy and reduce ionisation efficiency drastically.
    3. It is a miniaturised Helicon thruster. Theoretical analysis probably does not consider near field effects. Far field models are probably not applicable due to the size of the thruster.

    I expect some surprises during thruster testing. In any case - good luck!
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    Apparently, there is only one qualification constraint regarding CubeSat propulsion which is related to volatile propellant. Since they use water as propellant and are also the owner of the CubeSat it is actually up to them how they qualify their thruster. Given that it is also possible to qualify the thruster within 18 months - since they define what "qualification" means.
johannessimon81

There will be pizza on Mars - NASA awards $125000 for 3d-printed food - 0 views

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    Tea, Earl Grey, hot...
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    Lets see what part of the replicator will work first: the actual 3D-printing of the tea or the language recognition software...
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    Oh yes, I forgot about the language recognition... The abominations it might produce... :-[]
dejanpetkow

Holo-Deck 1.0 - YouTube - 3 views

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    Another Star Trek technology :)

    Might have an positive psychological effect if astronauts on long term missions could virtually escape their confinement - walking through a labyrinth with the blue sky above them. Ok, ISS does not provide enough space, but on Moon or Mars...
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    Is there not a risk that while walking in circles this way the cable I keep dragging behind will eventually strangle me?
Guido de Croon

Astro Drone, robotic crowd sourcing app released - 0 views

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    Today we released the Astro Drone app. People that have the Parrot AR drone can freely download the game. While they fly their drone in the real world, they are trying to dock to the ISS in the virtual world.

    But the app is more than a game. Players can choose to participate in a scientific crowd sourcing experiment that aims to improve autonomous capabilities of space probes, such as landing, obstacle avoidance, and docking. If participating, the app extracts visually salient features from the images made by the drone's camera. The features are then combined with the estimates of the drone's state and uploaded. The data is then used in a research aiming to improve robot navigation.
johannessimon81

Tiny Quantum Refrigerator Has Super Cooling Power - 0 views

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    Solid state tunnel junction can cool "payload" to sub-Kelvin temperatures. This would be much more convenient than for example helium3-helium4 mixing. Proposed use for cooling sensors on spacecraft - could extend lifetime of satellites like ESA's about to switched off Herschel almost indefinitely.
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