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User: astroboscope

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Comments · 164

  1. Re:Whay can't this be done on a planet scale? on Six Optical Telescopes Combined Into One · · Score: 1

    This is one of the differences between radio and optical interferometers: radio signals have so many more photons for the same same flux that they are indistingushable from waves (and they can be amplified, so there are plenty of photons to go around for comparisons). At higher frequencies the number of photons drops, and quantum effects are important and problematic.

  2. Re:Try preemtable kernel patch... on Swap Performance in Linux · · Score: 1
    You might also consider a crazy idea of having swap file on NFS -- you'll get (if your network is decent) almost the same bandwidth as you get when accessing (older) disk, but much higher latency (this will put your background process in disadvantage compared to your interactive processes).

    A neat idea, but wouldn't that just migrate the problem to the NFS host? I'm too lazy to try it myself.

  3. Re:Quamtum Computing on Factoring Breakthrough? · · Score: 1
    Cryptography is not in danger, it's public key exchange.

    How can you sign anything with quantum computing? The only way I can think of is to transmit a shared secret over the secure channel, but this is much more inconvienient than a "web of trust" or certificate system. Far too many laypeople think that encryption is only for terrorists and other people who keep secrets (everyone, but they forget that) because they don't know about signing. I hope I'm wrong.

  4. Re:another key difference on Marvel Universe Is Almost Like *Real Life* Society · · Score: 1
    in reality, there are realitively few people who ...turn into a gigantic green monster when they are angry.

    That's because relatively few people get physics degrees and wear purple pants. Sheesh! They want all the fun but none of the work!

  5. Are they realistic when they aren't superheroing? on Marvel Universe Is Almost Like *Real Life* Society · · Score: 1
    Now you've got me thinking: what is the correlation function of characters who know each other outside of heroing, i.e. all the people who know Peter Parker, etc.

    Don't forget that Galactus made Aunt May one of his heralds while she was babysitting Franklin Richards. That should count for something.

  6. Re:Stories like this prove that scientists are sup on Marvel Universe Is Almost Like *Real Life* Society · · Score: 1
    D'oh! That subject was supposed to go on this message!

    I meant to say but ran out of space:
    Scientists also have huge crossovers (big conferences) with roughly the same frequency and guest spots (talks at other institutions). It's no surprise that superheroes don't show much clustering.

  7. Stories like this prove that scientists are super on Marvel Universe Is Almost Like *Real Life* Society · · Score: 1
    Stories like this, on important social issues that must be addressed, are why I read slashdot.

    Why people are examining clusters in comics I don't know.

    Forget /., this was in nature! The same magazine that just about all scientists want to have their latest work published in.

    Clustering is important to scientists though, (clustering of galaxies gives clues about the Big Bang), and networks for anyone who uses one ;-) so I guess it struck a chord.

  8. Re:Damn straight on Marvel Universe Is Almost Like *Real Life* Society · · Score: 1

    So that's why people live there! ...but then why are the women there? (Sorry, St. Vonnegut!)

  9. Re:The Idea on Putting An Observatory On The Moon's 'Dark' Side · · Score: 1
    As far as the meteor problem, it's always a risk with space-based astronomy. IIRC, one of Hubble's solar panels was hit by a small meteor, but it's still going.

    More importantly, human RFI is MUCH more annoying than solar RFI (which solar astronomers call signal). On Earth, human RFI can come from any direction and be incredibly strong. The Sun is only a problem if the telescope is pointed very close (within a few degrees) to it. For a wide range of frequencies, it's not a problem. I've observed during the day, looking at very distant objects that happened to be close to the Sun's direction, without any trouble. At other frequencies, nighttime is preferred because of the Sun's effects on the atmosphere. That's not a problem in a vacuum!

  10. Re:Do real astronomers call it the 'dark side'? on Putting An Observatory On The Moon's 'Dark' Side · · Score: 1
    We call it the far side, because it is the side that is farthest from us. It seems pretty simple to me.

    What I'd like to know is where this "dark side" business came from, and why it is so popular among laypeople.

  11. Re:Why is a proton beam like a nova? on Canadian Researchers Create Supernova In-lab · · Score: 1
    The tricky part about adding protons to nuclei is that like charges repel, so the protons tend to get deflected before they hit the nucleus. For some reason that I forget, this is called the "r-process" of making new nuclei.

    But it's theorized that these reactions (and others) happen in supernovae, and now TRIUMF have shown that it really is doable. This is important because we are mostly made up from the products of these reactions, i.e. most of the elements heavier than helium, and all of the ones heavier than iron, are made in supernovae.

    Also, doing the reaction in the lab lets us measure the cross section, which experimentally pins down more of our model of what's going on in massive stars.

  12. Re:This is nothing! on Canadian Researchers Create Supernova In-lab · · Score: 1

    Hey! I do too have a goatee! (and a mustache)

  13. Re:competition on Canadian Researchers Create Supernova In-lab · · Score: 1

    Mod it up! It's really funny, eh!

  14. Re:Just as good, eh? on Evidence of Bacterial Life on Europa · · Score: 1

    I wouldn't call liquid water "completely inhospitable to life", especially since the ecosystems around each smoker are more or less the same; i.e. organisms are successfully swimming some distance through the cold water to get there. There's no evidence of anything like different DNA coding systems to indicate that life began at black smokers. The big problem with them is that they only last 50-100 years, IIRC. Certainly not the millions of years that we expect is necessary for molecules to get together and spontaneously start life. Maybe Europa's tides keep its vents open longer, but your statement about Earth has a lot going against it.