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Death Zone of the Rosette Nebula -A Galaxy Classic http://petrochemical.gronerth.com/forumchem/viewtopic.php?f=7&t=32 |
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Author: | YYY_kuif_YYY [ Tue Apr 21, 2009 2:58 am ] |
Post subject: | Death Zone of the Rosette Nebula -A Galaxy Classic |
University of Arizona astronomers have surveyed a thousand stars in the
Posted by Luke McKinney. Source: http://www.livescience.com/space/070418_star_dangerzone.html Fuente |
Author: | YYY_kuif_YYY [ Tue Apr 21, 2009 2:59 am ] |
Post subject: | Space Travel Beyond the Solar System -Is It Possible? VIDEO |
SETI Astronomer Seth Shostak talked to the New York Times about going to other planets, and why we wimpy fleshbags weren"t ever going to manage it. Though this attitude may be influenced by a career of holding still and waiting for signals to arrive, he still makes some good points - and when a guy who watches the entire universe the way you"d watch your inbox talks, it"s a good idea to listen.
The main obstacle to manned exploration of other planets is the truly mind-melting distances involved - measured in light years, basically "the fastest speed in the universe multiplied by a really long time", meaning that even the closest planets are lifetimes away at any conventional speed. Shostak"s solution is an army of intelligent robots, and we have to say that as solutions go it"s hard to find a problem that wouldn"t solve. Robots can be accelerated far faster than fussy humans, who are all "I"m hungry" and "I"m thirsty" and "I need oxygen to survive" about interstellar travel. An armada of intelligent probes could map entire worlds for us, perhaps even bootstrapping their own factories and tools on arrival, sending back enormous amounts of data without us ever having to set foot outside our gravity well. We will anyway, of course, and that"s where we and Dr Shostak disagree. He paints a penned-in picture of humanity cut off from the rest of the universe by enormous distances, viewing alien worlds as interactive TV programming at best. But humanity"s entire history has been that of moving out as far as they can and living there as well, with little things like "is it possible to survive" taking second place to the need to explore. The only thing that"ll could stop us colonising the solar system is if we wipe ourselves out first, and once the eight-or-whatever planets are full (with entire nations in the asteroid belts) we"ll set our sights further afield. Limitations on interstellar exploration tend to say things like "according to current scientific knowledge" or "would require more energy than we can produce", which are reasonable until you realize they could equally apply to any other point in history. Getting to the moon would have required more horses than available to mankind in the 1700s, but that doesn"t mean there wasn"t another way to propel a craft. Cryosleep, generational ships, downloading our dinky selves into silicon hooked up to a growth-vat and a sample of skin: whatever it takes to get out of the solar system, some distant day an awesome group of individuals will do it. Posted by Luke McKinney <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/HZkyRl5IreM&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/HZkyRl5IreM&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object> Fuente |
Author: | Y_nezcuttowi_Y [ Fri May 01, 2009 8:03 pm ] |
Post subject: | Super-Fleet of Observatories Finds Most Massive Galaxies Ever to Exist |
The biggest things in the universe are invisible (but that doesn"t matter, because if your wimpy human eye was even out there to see them it would be too busy freezing, suffocating, or freaking out over how the hell far away from home it is anyway). Scientists have used a super-network of the world"s most awesome observatories to look at the most massive galaxies ever to exist.
These megamassive star collections are so far away that their light has been shifted out of the visible spectrum, just by the doppler effect of the expanding universe. In an awesome Voltron-like combination, which is presumably also keeping its incredibly eye out for Galactus, the ESA"s XMM X-Ray Observatory hooked up with NASA"s Hubble, Chandra and Spitzer satellites to create a super-sensor survey able to observe the immense galaxies. By immense, we mean ten times the size of the Milky Way immense. Ten quadrillion septillion tons immense, aka "Utterly makes a mockery of our language"s ability to describe the concept of"-immense. English is only designed up to the scale of fat people, maybe elephants. By the time you get to these galaxies you have to wave around numbers no-one"s even heard of, or say "1.2E46 kg" for the few with scientific notation skills. The study not only found these fantasti-vast things, we now know how they happened. You don"t get to be a big star (collection) by just believing in yourself - you get there by eating other galaxies, which may be why Disney just sticks with the "believing in yourself" bit. Each of these gargantuan galaxies results from at least two mergers, sub-stupidly-large galaxies ramming each other in an event like a thousand Micheal Bay clones in a fireworks factory the size of space itself. So the next time you hear about a big corporate merger, remember it"s like two hydrogen atoms talking about maybe making a molecule. There"s big stuff out there, and some people are cool enough to look for it. Posted by Luke McKinney. Survey reveals Universe"s First Big Galaxies Source |
Author: | Y_nezcuttowi_Y [ Thu May 07, 2009 12:35 pm ] |
Post subject: | Mar"s Missing Magnetic Field: Was It KO"d from Space? (VIDEO) |
If you"ve seen The Core then you that the only thing between us and instant space-death is a magnetic field. You also know that"s the only thing that"s even heard of real science in the entire movie, but it"s a pretty important one - and could explain why the otherwise eminently habitable Mars is such a barren wasteland. Scientists think the Martian magnetic field might have been hammered into submission by strikes from space.
Planetary magnetic fields are created by massive molten metal currents within the planet"s core. A flowing current creates a magnetic field, even when the current is massive volumes of charged liquid metal moving under the influence of temperature gradients (convection) - in fact, especially then. But magnetic analysis of Martian sites by Berkeley researchers show that the red planet"s protective field was switched off half a billion years ago, and now some scientists say they know why. John Hopkins University scientists have calculated that a period of massive asteroid impacts, known to have happened around the same time, could not only have massively impacted on the surface Deep Impact-style (with all the atmospheric alteration and great-big-crater-making that entails) but added enough energy to the planet to heat up the outer layers of the planet. Without the huge temperature difference between the core and mantle, the mega-magnetic dynamo convection currents would be switched off - and unable to start up again when things cooled down. Remember, planetary core behavior is still carrying on from when the planets first formed - as far as they"re concerned the whole "crust" thing and all life as we know it is just a cooling scum on the surface. If you break something from back then you just don"t have the juice to start it up again. Without the magnetic field Mars is defenseless against the radiation that constantly pours in from space (never mind the Fantastic Four, the only superpower cosmic rays"ll give you is decomposition). Earth is thought to have survived the same space-bombing because of our superior size, with our dynamo maybe stuttering a little but - very importantly - not stopping. As you can maybe tell by they way you exist. Posted by Luke McKinney. Did Mars" Magnetic Field End With A Bang Or A Whimper? Fuente |
Author: | Y_nezcuttowi_Y [ Fri May 08, 2009 8:03 pm ] |
Post subject: | How to Fly a Space Shuttle |
ABC News reporter gets lessons from an astronaut. Fuente |
Author: | tioggak [ Sat May 09, 2009 8:26 pm ] |
Post subject: | Mystery Star Speeding Through Milky Way at 3 Million MPH -A Galaxy Classic |
One of the the fastest-moving stars ever discovered in the Milky Way has challenged theories about why it"s moving so fast. The object is a piece of the Puppis A supernova remnant created when a massive
"Just after it was born, this neutron star got a one-way ticket out
In the case of RX J0822-4300, a tremendous lopsided supernova
Posted by Casey Kazan. Related Galaxy posts: Link: http://news.xinhuanet.com/english/2007-11/29/content_7167962.htm  ÂÂÂFuente |
Author: | Y_nezcuttowi_Y [ Mon May 11, 2009 4:22 pm ] |
Post subject: | Dwarf Galaxies Orbiting The Milky Way Nix Newton |
It turns out that we don"t know everything about the universe. Shocking, we know, but you"d be surprised how often science writers, politicians, or intelligent design idiots confuse "non-omniscience" with "everything is WRONG!"  Now some are saying that Newton screwed up, but at least their evidence is awesome: dwarf galaxies orbiting the Milky Way!
There wasn"t a lot of near-light-speed motion at the time, nor any neutrinos, and it"s important to remember that the people who build bridges don"t go with general relativity or quantum mechanics - it"s all the three laws of force, baby. You only find you need further theorios when you look outside, and Professor Pavel Kroupa of the University of Bonn and colleagues have looked as outside as you can reasonably get: analyzing the motions of dwarf galaxies, thousands of starts orbiting the entire Milky Way. There they"ve found some fascinating contradictions. Instead of being uniformly distributed around the Milky Way, the dwarf galaxies orbit in a plane - almost like a set of planets. The group"s calculations show that these galaxettes can"t contain any dark matter - but then, observations of the orbital speed of the same shows that they MUST contain dark matter, as the extant material isn"t enough to explain their velocities. Clearly, something is wrong. There"s always a chance that the human calculations are the problem - after all, you can"t accuse the universe of being "wrong" when it"s already there, doing things, and doing them a quadrillion times bigger than you can even imagine. Basing calculations on something you"ve never seen is always going to be tricky (try "divide by a unicorn"), but that"s the entire point. In any other field, highlighting how wrong you are is the worst thing you can do - in science, it"s all about helping us find out new things. And if you know something you thought you knew is wrong, that"s even better - there"s something new in a place we already looked! Posted by Luke McKinney. Related Galaxy posts: Harvard-Smithsonian Center Reports Massive Black Holes Roaming the Milky Way (VIDEO) Souce |
Author: | Y_nezcuttowi_Y [ Sat May 16, 2009 3:59 pm ] |
Post subject: | Astronauts Face Toughest Hubble Repair Yet |
spacewalking astronauts floated outdoors to give the Hubble Space Telescope a better view of the cosmos by installing a new high-tech science instrument and fixing a broken camera. Fuente |
Author: | Y_nezcuttowi_Y [ Tue Jun 02, 2009 8:16 pm ] |
Post subject: | Reboot Your Brain? Science Says It"s Possible -A Galaxy Insight |
Animal studies conducted at the National Institute on Aging Gerontology Research Center and the Johns Hopkins University School of Medicine, for example, have shown that both calorie restriction and intermittent fasting along with vitamin and mineral intake, increase resistance to disease, extend lifespan, and stimulate production of neurons from stem cells. In addition, fasting has been shown to enhance synaptic elasticity,
Does the Human Brain Possess Latent “Super Powers�
Souce |
Author: | Y_nezcuttowi_Y [ Tue Jun 02, 2009 8:16 pm ] |
Post subject: | Human Cell Electric Fields Are As Powerful as Lighting Bolts -A Galaxy Classic |
This discovery is a surprising twist for cell researchers. Scientists
University of Michigan researchers led by chemistry professor Raoul
Souce |
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