tkdguy Posted February 10, 2015 Author Report Share Posted February 10, 2015 What would living on the Moon be like? Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 12, 2015 Author Report Share Posted February 12, 2015 Storm at the galaxy's core Why does the Milky Way rotate? Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 12, 2015 Author Report Share Posted February 12, 2015 This may be the next generation of spaceship Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted February 12, 2015 Report Share Posted February 12, 2015 The IXV's test flight went off without a hitch, it seems. Quote Link to comment Share on other sites More sharing options...
Old Man Posted February 13, 2015 Report Share Posted February 13, 2015 Yup. The Spacex launch did too, although thirty-foot seas prevented a barge landing attempt. They did guide the booster to a soft vertical landing within ten meters of an imaginary target in the water though, so that's promising. L. Marcus 1 Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted February 13, 2015 Report Share Posted February 13, 2015 Woho! Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 18, 2015 Author Report Share Posted February 18, 2015 Close call! What is it? Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 22, 2015 Author Report Share Posted February 22, 2015 Cable guys in space Quote Link to comment Share on other sites More sharing options...
Narf the Mouse Posted February 22, 2015 Report Share Posted February 22, 2015 Cable guys in space The difference is, you don't want this cable channel to be exciting. Or interesting. In fact, the more boring it is, the better. Quote Link to comment Share on other sites More sharing options...
dmjalund Posted February 22, 2015 Report Share Posted February 22, 2015 They're crazy!Craaazyyy!THEY saidI was mad. But I showed them! Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 25, 2015 Author Report Share Posted February 25, 2015 What's the matter? HUGE black hole discovered Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 25, 2015 Author Report Share Posted February 25, 2015 Water found in helmet after spacewalk Russia will use ISS until 2024 Chinese rocket booster breaks up, Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 25, 2015 Report Share Posted February 25, 2015 HUGE black hole discovered The real issue here is that it's got a mass estimate of 12 billion solar masses, and it's at a redshift of 6.3, which makes it very massive at very early time, less than a billion years after the Big Bang. That combination is really hard to do. tkdguy 1 Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted February 26, 2015 Report Share Posted February 26, 2015 Once is enough! Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted February 26, 2015 Report Share Posted February 26, 2015 Have you guys seen the latest Ceres pics? That bright spot is two spots - at least. tkdguy 1 Quote Link to comment Share on other sites More sharing options...
Old Man Posted February 27, 2015 Report Share Posted February 27, 2015 They're multiplying! Quote Link to comment Share on other sites More sharing options...
tkdguy Posted February 28, 2015 Author Report Share Posted February 28, 2015 Buzz Aldrin: USA needs a Mars colony Quote Link to comment Share on other sites More sharing options...
DShomshak Posted February 28, 2015 Report Share Posted February 28, 2015 Re: The black hole that's too big, too early in the universe's history, some months back (IIRC) Scientific American had an article on mathematical simulations of the first stars. Thing is, these "Population III" stars would be almost pure hydrogen and helium, and so they wouldn't burn the same way as modern stars. Apparently a pure H/He core can't become as dense, which means a forming star can accumulate greater mass, which means these early stars could reach up to a million solar masses! They'd have these immense, relatively diffuse cores... until enough heavier elements were produced, at which point they would collapse. As the astrophysicists observed, it's easier to explain billion-solar-mass black holes if you start with million-solar-mass stars instead of 100-solar-mass stars. (All still theoretical, of course, but one more reason to want bigger telescopes.) Dean Shomshak Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted February 28, 2015 Report Share Posted February 28, 2015 Interesting. The last I heard in that way was a stellar mass limit of 300 solar masses. Quote Link to comment Share on other sites More sharing options...
Cancer Posted March 2, 2015 Report Share Posted March 2, 2015 For static stars, it's something like that. The larger mass limits are things that are never actually stable, but they last long enough and get hot and dense enough in their cores to start fusion processes on a large enough scale to produce enough heavy elements so ordinary stars can form. The stellar interiors calculations get really hairy when you can't be in equilibrium, but last I heard, if any of those zero-metals things makes carbon in any quantity then the rate of energy generation spikes very hard and you might get heavier things during one of those high-temperature flashes. DShomshak 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted March 2, 2015 Report Share Posted March 2, 2015 And supposedly Dawn arrives at Ceres this week, though it has a lengthy episode of orbit adjustment to get into its close orbit. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted March 2, 2015 Report Share Posted March 2, 2015 Looking forward to it. Quote Link to comment Share on other sites More sharing options...
Old Man Posted March 2, 2015 Report Share Posted March 2, 2015 And supposedly Dawn arrives at Ceres this week, though it has a lengthy episode of orbit adjustment to get into its close orbit. It's interesting that Dawn is equipped with an ion drive and as a result there's no nail-biting ten-second make-or-break burn to enter orbit. Boring... but so much more reliable. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted March 2, 2015 Report Share Posted March 2, 2015 Kinda like an interplanetary Vespa. Quote Link to comment Share on other sites More sharing options...
tkdguy Posted March 3, 2015 Author Report Share Posted March 3, 2015 No Big Bang after all? The "impossible" galaxy Quote Link to comment Share on other sites More sharing options...
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