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Alexander Wittig

Nature Today | First tomatoes and peas harvested on Mars and moon soil simulant - 2 views

www.naturetoday.com/...message

science BIO

shared by Alexander Wittig on 10 Mar 16 - No Cached
fichbio liked it
  • Alexander Wittig on 10 Mar 16
     
    Researchers from Alterra Wageningen UR were able to grow and harvest ten different crop species on Mars and moon simulant. 'The total above ground biomass produced on the Mars soil simulant was not significantly different from the potting compost we used as a control' researcher Wieger Wamelink said. I wonder if the taste was as disappointing as that of normal dutch veggies :P
Lionel Jacques

Hubble to Watch Historic Venus Transit, Using Moon as Mirror - 2 views

www.space.com/e-telescope-venus-transit.html

space science Venus transit Hubble

shared by Lionel Jacques on 07 May 12 - No Cached
  • Lionel Jacques on 07 May 12
     
    "Scientists are planning to use NASA's Hubble Space Telescope to observe next month's historic transit of Venus across the sun's face. But there's a twist. Researchers can't point Hubble anywhere near the sun, because our star's bright light could damage the telescope's super-sensitive instruments. So Hubble will watch the June 5-6 Venus transit by using the moon as a mirror."
  • Nicholas Lan on 08 May 12
     
    aha. i suggested something like this a few years ago
LeopoldS

Getting to the Moon on Drops of Fuel - 3 views

actu.epfl.ch/...g-to-the-moon-on-drops-of-fuel

shared by LeopoldS on 30 Mar 12 - No Cached
johannessimon81

Interactive Mars panorama - 0 views

www.panoramas.dk/...curiosity-first-color-360.html

space science technology

shared by johannessimon81 on 03 Sep 12 - No Cached
  • johannessimon81 on 03 Sep 12
     
    For those who can't wait to be on Mars... ;-) - Oh and for those who want to see some REALLY cool panorama's: the moon @ http://www.panoramas.dk/moon/apollo-17.html
Dario Izzo

A little bit of ACT and NVIDIA Goes to the Moon with CUDA and Tegra - 3 views

vr-zone.com/...14146.html

AI

shared by Dario Izzo on 08 Dec 11 - No Cached
LeopoldS liked it
  • Dario Izzo on 08 Dec 11
     
    The famous Mars Rover Simulator was a piece of the Evolution in Robotic Island Ariadna!!!!! But again, its only an algorithm :) whats new?
  • Ma Ru on 08 Dec 11
     
    Go Plymouth!
Lionel Jacques

Russian Craft Fails to Head to Mars Moon - 1 views

www.thestar.com/...t-toxic-falling-satellite-ever

space technology science

shared by Lionel Jacques on 09 Nov 11 - No Cached
  • Lionel Jacques on 09 Nov 11
     
    Out-of-control Russian space probe may be 'most toxic falling satellite ever: A Russian space probe aiming to land on a Mars moon was stuck circling the Earth after equipment failure Wednesday, and scientists raced to fire up its engines before the whole thing came crashing down.
  • Ma Ru on 09 Nov 11
     
    Is it just me, or is uncontrolled space junk re-entry becoming trendy?
  • LeopoldS on 12 Nov 11
     
    this was a fantastic mission - ... what a pity!
Tom Gheysens

Anaerobic oxidation of methane coupled to nitrate reduction in a novel archaeal lineage : Nature : Nature Publishing Group - 0 views

www.nature.com/...nature12375.html

bio science space

shared by Tom Gheysens on 06 Aug 13 - No Cached
  • Tom Gheysens on 06 Aug 13
     
    A possible way of teraforming some planets or moons?
Dario Izzo

Optimal Control Probem in the CR3BP solved!!! - 7 views

math.u-bourgogne.fr/...research

OCP CR3BP trajectory MAD

shared by Dario Izzo on 07 Jun 11 - No Cached
  • Dario Izzo on 07 Jun 11
     
    This guy solved a problem many people are trying to solve!!! The optimal control problem for the three body problem (restricted, circular) can be solved using continuation of the secondary gravity parameter and some clever adaptation of the boundary conditions!! His presentation was an eye opener ... making the work of many pretty useless now :)
  • ...13 more comments...
  • Ma Ru on 08 Jun 11
     
    Riemann hypothesis should be next... Which paper on the linked website is this exactly?
  • Joris _ on 08 Jun 11
     
    hmmm, last year at the AIAA conference in Toronto I presented a continuation approach to design a DRO (three-body problem). Nothing new here unfortunately. I know the work of Caillau, although interesting what is presented was solved 10 years ago by others. The interest of his work is not in the applications (CR3BP), but in the research of particular regularity conditions that unfortunately make the problem limited practically. Look also at the work of Mingotti, Russel, Topputo and other for the (C)RTBP. Smart-One inspired a bunch of researchers :)
  • Dario Izzo on 08 Jun 11
     
    Topputo and some of the others 'inspired' researchers you mention are actually here at the conference and they are all quite depressed :) Caillau really solves the problem: as a one single phase transfer, no tricks, no misconvergence, in general and using none of the usual cheats. What was produced so far by other were only local solutions valid for the particular case considered. In any case I will give him your paper, so that he knows he is working on already solved stuff :)
  • Dario Izzo on 08 Jun 11
     
    Answer to Marek: the paper you may look at is: Discrete and differential homotopy in circular restricted three-body control
  • Joris _ on 08 Jun 11
     
    Ah! with one single phase and a first order method then it is amazing (but it is still just the very particular CRTBP case). The trick is however the homotopy map he selected! Why this one? Any conjugate point? Did I misunderstood the title ? I solved in one phase with second order methods for the less restrictive problem RTBP or simply 3-body... but as a strict answer to your title the problem has been solved before. Nota: In "Russell, R. P., "Primer Vector Theory Applied to Global Low-Thrust Trade Studies," JGCD, Vol. 30, No. 2", he does solve the RTBP with a first order method in one phase.
  • Joris _ on 08 Jun 11
     
    I think what is interesting is not what he solved, but how he solved the problem. But, are means more important than end ... I dunno
  • Dario Izzo on 08 Jun 11
     
    I also loved his method, and it looked to me that is far more general than the CRTBP. As for the title of this post, OK maybe it is an exageration as it suggests that no solution was ever given before, on the other end, as Marek would say "come on guys!!!!!"
  • Joris _ on 09 Jun 11
     
    The generality has to be checked. Don't you think his choice of mapping is too specific? he doesn't really demonstrate it works better than other. In addition, the minimum time choice make the problem very regular (i guess you've experienced that solving min time is much easier than mass max, optimality-wise). There is still a long way before maximum mass+RTBP, Topputo et al should be re-assured :p Did you give him my paper, he may find it interesting since I mention the homotopy on mu but for max mass:)
  • Dario Izzo on 09 Jun 11
     
    Joris, that is the point I was excited abut, at the conference HE DID present solutions to the maximum mass problem!! One phase, from LEO to an orbit around the moon .. amazing :) You will find his presentation on line.... (according to the organizers) I gave him the reference to you paper anyway, but no pdf though as you did not upload it on our web pages and I could not find it in the web. So I gave him some bibliography I had with be from the russians, and from Russell, Petropoulos and Howell, As far as I know these are the only ones that can hope to compete with this guy!!
  • Joris _ on 09 Jun 11
     
    for info only, my phd, in one phase: http://pdf.aiaa.org/preview/CDReadyMAST08_1856/PV2008_7363.pdf I prefered Mars than the dead rock Moon though!
  • Dario Izzo on 09 Jun 11
     
    If you send me the pdf I can give it to the guy .. the link you gave contains only the first page ... (I have no access till monday to the AIAA thingy)
  • LeopoldS on 11 Jun 11
     
    this is why I like this Diigo thingy so much more than delicious ...
  • tvinko on 17 Jun 11
     
    What do you mean by this comment, Leopold? ;-) Jokes apart: I am following the Diigo thingy with Google Reader (rss). Obviously, I am getting the new postings. But if someone later on adds a comment to a post, then I can miss it, because the rss doesn't get updated. Not that it's a big problem, but do you guys have a better solution for this? How are you following these comments? (I know that if you have commented an entry, then you get the later updates in email.) (For example, in google reader I can see only the first 5 comments in this entry.)
  • LeopoldS on 18 Jun 11
     
    I like when there are discussions evolving around entries
  • LeopoldS on 18 Jun 11
     
    and on your problem with the RSS Tamas: its the same for me, you get the comments only for entries that you have posted or that you have commented on ...
Francesco Biscani

Hints of Life Found On Saturn's Moon Titan - 1 views

science.slashdot.org/...fe-Found-On-Saturns-Moon-Titan

bio

shared by Francesco Biscani on 05 Jun 10 - Cached
  • Ma Ru on 05 Jun 10
     
    "... although non-biological chemical reactions could also be behind the observations." Come on, everyone knows life is flourishing on Europa, not Titan.
Juxi Leitner

Astrobotic announces expanded opportunities to send payloads to the Moon : Astrobotic Technology, Inc - 1 views

astrobotictechnology.com/...s-to-send-payloads-to-the-moon

lunar rover tech technology space opportunities piggyback payload

shared by Juxi Leitner on 25 Jun 10 - Cached
  • The remaining 229 pounds are available for $700,000 per pound, plus a $250,000 fee per payload to cover the engineering costs of integrating it into either the expedition’s lander or its solar-powered robot.
Juxi Leitner

NASA Team Has Plan to Send a Robot to the Moon - NYTimes.com - 1 views

www.nytimes.com/...02robot.html

nasa technology space robotics bipad lunar exploration

shared by Juxi Leitner on 03 Nov 10 - No Cached
Joris _ liked it
  • Juxi Leitner on 03 Nov 10
     
    background piece on Project M, it is being worked on at least it seems so ...
  • Joris _ on 03 Nov 10
     
    there should be more project like these - when you give a tough deadline and work your heart out to make things happen... look forward to see it walking on the Moon :)
Juxi Leitner

Technology Review: Blogs: arXiv blog: Physicist Discovers How to Teleport Energy - 4 views

www.technologyreview.com/...24759

tech phy quantum entanglement nrg

shared by Juxi Leitner on 09 Feb 10 - Cached
pacome delva liked it
  • He gives the example of a string of entangled ions oscillating back and forth in an electric field trap, a bit like Newton's balls. Measuring the state of the first ion injects energy into the system in the form of a phonon, a quantum of oscillation. Hotta says that performing the right kind of measurement on the last ion extracts this energy. Since this can be done at the speed of light (in principle), the phonon doesn't travel across the intermediate ions so there is no heating of these ions. The energy has been transmitted without traveling across the intervening space.
  • Juxi Leitner on 09 Feb 10
     
    wonder if we can use that to power a moon base .... or on-board a SBSP satellite
  • ...1 more comment...
  • LeopoldS on 09 Feb 10
     
    will still have to read the actual article but am a bit sceptic if this interpretation really will hold ... what are our fundamental physicists saying about this?
  • Juxi Leitner on 10 Feb 10
     
    I am not the physicist but I thought it might be interesting, from a space security point-of-view
  • pacome delva on 11 Feb 10
     
    Yes it seems really interesting and opens new possibilities. However this technology review article is not very good and the guy uses terms which have a precise meaning (like teleportation), which is different from the word we know... Quantum teleportation is what we use for designing quantum computers, but we are quite far from any practical applications. This energy teleportation will allow new scheme involving energy (if it is experimentally confirmed) which is very nice. However it seems this occurs in an entangled many-body system, which the only macroscopic one I know is a bose-eintein condensate (BEC). So it would mean infuse energy in the BEC by doing a measurement on one of the atom and extract it few millimeters away by doing a measurement on another atom. very far from any long distance power transmission...
Joris _

Observatory - Cassini Data Solves Mystery of Iapetus's Two-Tone Surface - NYTimes.com - 4 views

www.nytimes.com/...15obmoon.html

space planets moon

shared by Joris _ on 16 Dec 09 - Cached
  • dust, most likely from another of Saturn’s moons, falls on the leading side of Iapetus as it orbits the planet
nikolas smyrlakis

NASA Discovers Pac-Man On Death Star Saturn Moon - Mimas - 2 views

gizmodo.com/...+man-on-death-star-saturn-moon

nasa pacman cassini mimas

shared by nikolas smyrlakis on 30 Mar 10 - Cached
  • nikolas smyrlakis on 30 Mar 10
     
    Pac-Man actually lives on the Death Star!
Giusi Schiavone

coming back to the Moon - 2 views

www.googlelunarxprize.org/...about-the-prize

shared by Giusi Schiavone on 28 Feb 11 - Cached
  • Giusi Schiavone on 28 Feb 11
     
    The $30 million Google Lunar X PRIZE will be awarded to the first privately funded teams to build robots that successfully land on the lunar surface, explore the Moon by moving at least 500 meters (~1/3 of a mile), and return high definition video and imagery. The Google Lunar X PRIZE expires whenever all prizes are claimed, or at the end of 2015. As of midnight on December 31st, 2010, the team registration for the Google Lunar X PRIZE is closed. No additional applicants will be accepted to join the competition. ...too late
  • LeopoldS on 02 Mar 11
     
    please see the act report on this from a few years ago - its on the wiki - should we maybe make an update analysis? any volunteers? Giusi?
  • Giusi Schiavone on 02 Mar 11
     
    I'll have a look
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