Green Baron

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About Green Baron

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    In my orbit the sun never sets

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  1. Green Baron

    Historical day for SI

    It was per definition 1kg until recently. It is little bit less now because of all the rubbing and cleaning and photographing ... I can imagine that an x-act number in reference to the freezing point of water will be available in a few cesium atom vibrations.
  2. Green Baron

    For Questions That Don't Merit Their Own Thread

    Fun (?) fact: the American Squirrel was introduced in Europe and seems to be fitter than the European red version. It is replacing it. Better memory, eh ? Or ruthless enough to rob bird feeders ? https://www.researchgate.net/publication/242084905_Introduction_of_the_American_grey_squirrel_Sciurus_carolinensis_in_Europe_A_case_study_in_biological_invasion
  3. Green Baron

    Historical day for SI

    Just for completeness:
  4. Green Baron

    Interstellar Interloper (A/2017 U1)

    Apparently, the wild speculations at the far fringes of science and beyond have not yet been published. -------------- In the meantime, something from the science front on the matter: https://export.arxiv.org/abs/1810.02148 The authors suggest that 'Oumuamua is unlikely one of the objects that fits our classification. But there could be quite a range of possible situations where icy planetesimals could be ejected from protoplanetary disks and Oma may be one of them. Also, as these objects may be rare in our vicinity, it may be difficult to find a sample in the meteorite data at hand.
  5. Green Baron

    Finally, a planet around Barnard’s Star!

    ESO blog post on the matter. I haven't read it (not the time), maybe it is interesting for you guys: https://www.eso.org/public/blog/searching-for-an-exoplanet/ One figure met my eye: 4.3km/h. Apparently the observed speed change. Doh.
  6. Just checked the ESO site: the VLTI (I=interferometer) has a resolution power of a milliarcsecond at near infrared wavelengths (or as they say 0.1 AU at 100pc). So from that point it could do it if other circumstances permit and Barnard b does exist (which is not yet confirmed).
  7. And observation time. These machines have a procedure for proposals and a consortium chooses which ones to carry through. There is a long list to work through and they are "booked" a long time in advance. So, even if they decide now to look at Barnard's face, it might take a year or so until they actually do. But, who knows, maybe somebody is so nice and gives up his turn in favour of .... (speculating :-))
  8. I wouldn't call it a "problem", there are already extraordinary results with the VLT and its new planet imager SPHERE. https://www.eso.org/public/usa/news/eso1821/ (370ly away) Just give it a few years more, i say. It is young technology, procedures, data evaluation, observation techniques, that is all in development. Soon(tm) we'll have an image of a rocky planet around a nearby star :-)
  9. Just tried to log in as Green Barnard .... It took 20 years of observation but there is a good chance that Barnards's Star has a cold rocky planet of >=3 earth masses and an orbit of around 233 days, derived from angular motion. Angular size of orbit could be 220 milliarcseconds, making it a candidate for future direct observation. For comparison, structures that can be resolved with the EHT are in the range of 20 microarcseceonds ... paper
  10. Timelapse and photo series of an exoplanet (Gas giant Beta Pictoris B) in a distance of 63ly. It orbits its sun in a distance comparable to Saturn and an orbit takes ~22 years. Images taken by the VLT. https://www.eso.org/public/videos/ https://www.eso.org/public/images/potw/ Getting closer ;-) (looks like the ESO site has momentary problems with its links) Youtube works: I am pretty confident that a larger interferometer with the participation of one of the huge dishes under construction can get a pretty close look on much smaller objects closer to their suns.
  11. Green Baron

    For Questions That Don't Merit Their Own Thread

    Probably depends on what one puts in it. And there may be "squirrel proof" designs out there. Can be interpreted as an example of negative environmental effects of feeding wild birds, as sorry as i am to state this ...
  12. The most reasonable proposal (and btw. welcome :-)) i find. I see two things: first the orbits must be absolutely circular or the planets would peep around the sun's edge. Or they must be absolutely synchronous because of the different velocities on their respective orbits. Second: the sun must not be too "heavy", so that light bent around it does not allow for too deep a view behind it. This setup worked for the last few hundred years (one does not need more, powerful telescopes aren't that old yet), and then something happens, a periodical or single time constellation of other planets, that slightly changes the orbits .... I like your idea :-) Improbable imo: both civs must have developed identically during billions of years of evolution, so that they reach a state of using radio at the same time.
  13. Green Baron

    For Questions That Don't Merit Their Own Thread

    @kerbiloid, you don't have the complete picture. We don't see the pictures of the so called "collateral damage" caused by automatic weapons, drones, guided bombs and so on because they are too terrible and filtered out. Dead children in the street after the "erroneous" bombing of a school, or hospital (which is done systematically by all sides). People torn apart, burnt, suffocated and so on. I could post some but that will call the moderators and is not an appropriate content here. A friend of mine works in a news department of a large German public company (The ZDF) and regular sorts out pictures like these. She needs help every now and then ... This is mostly done by automatic weapons these days. The murderers never see their victims. Not even in the every day news.
  14. Green Baron

    My theory on lift.

    I wanted to quit, but you don't let me :-) I have actually described how they form and so have you, right ? It is the pressure equalization between under- and upper wing surface. And they are behind the wing up to several kilometers, not at the side or under it. There are a plethora of photographs all over the web visualizing them. An airliner has heavy ones, a glider almost none with its high aspect. Were the wing shoving air down, the air would be squeezed to the side when it lands or takes of, causing heavy gusts to nearby thing like waiting aircraft, people at the fences, etc. But there is no such thing. Behind the craft, though, things can get funny. But you surely know that - horizontal spacing separation and all that. Quitting one more time :-)
  15. Green Baron

    My theory on lift.

    Dude, some of the drag is induced by the wing depending on lift (heavily depending on design, very little from a highly effective glider), but apart from that drag and lift are fundamentally different things, actually two of the fundamental forces on a flying apparatus. But lift induced drag plays little role at low aoa. That is (again) why i proposed that experiment. Again, i don't move air down nor does a wing. If it did, you'd have heavy winds at the side of a landing or starting aircraft, which is not the case. The equalizing of the pressures mostly takes place behind it, in the wake turbulence. Which probably is the induced drag you meant. But that is an outcome of the generated lift (or the pressure difference), it is not the cause of it. With that, I quit. It doesn't move the world at all. Have a nice one everybody :-)