Tag results for supernova
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the riddle of antimatter
Bookmarked 720 weeks ago watch this and other space videos at http:spaceripcomin high-res 1080p explores one of the deepest mysteries about the origin of our universe according to standard theory the early moments of the universe were marked by the explosive contact between subatomic particles of opposite charge featuring short interviews with masaki hori tokyo university and jeffrey hangst aarhus universityscientists are now focusing their most powerful technologies on an effort to figure out exactly what happened our understanding of cosmic history hangs on the question: how did matter as we know it survive and what happened to its birth twin its opposite a mysterious substance known as antimatter a crew of astronauts is making its way to a launch pad at the kennedy space center in florida little noticed in the publicity surrounding the close of this storied program is the cargo bolted into endeavor039s hold it039s a science instrument that some hope will become one of the most important scientific contributions of human space flightit039s a kind of telescope though it will not return dazzling images of cosmic realms long hidden from view the distant corners of the universe or the hidden structure of black holes and exploding starsunlike the great observatories that were launched aboard the shuttle it was not named for a famous astronomer like hubble or the chandra x-ray observatorythe instrument called the alpha magnetic spectrometer or ams the promise surrounding this device is that it will enable scientists to look at the universe in a completely new way most telescopes are designed to capture photons so-called neutral particles reflected or emitted by objects such as stars or galaxies ams will capture something different: exotic particles and atoms that are endowed with an electrical charge the instrument is tuned to capture quotcosmic raysquot at high energy hurled out by supernova explosions or the turbulent regions surrounding black holes and there are high hopes that it will capture particles of antimatter from a very early time that remains shrouded in mysterythe chain of events that gave rise to the universe is described by what039s known as the standard model it039s a theory in the scientific sense in that it combines a body of observations experimental evidence and mathematical models into a consistent overall picture but this picture is not necessarily completethe universe began hot after about a billionth of a second it had cooled down enough for fundamental particles to emerge in pairs of opposite charge known as quarks and antiquarks after that came leptons and antileptons such as electrons and positrons these pairs began annihilating each othermost quark pairs were gone by the time the universe was a second old with most leptons gone a few seconds later when the dust settled so to speak a tiny amount of matter about one particle in a billion managed to survive the mass annihilation that tiny amount went on to form the universe we can know - all the light emitting gas dust stars galaxies and planets to be sure antimatter does exist in our universe today the fermi gamma ray space telescope spotted a giant plume of antimatter extending out from the center of our galaxy most likely created by the acceleration of particles around a supermassive black hole the same telescope picked up signs of antimatter created by lightning strikes in giant thunderstorms in earth039s atmosphere scientists have long known how to create antimatter artificially in physics labs - in the superhot environments created by crashing atoms together at nearly the speed of lighthere is one of the biggest and most enduring mysteries in science: why do we live in a matter-dominated universe what process caused matter to survive and antimatter to all but disappear one possibility: that large amounts of antimatter have survived down the eons alongside matterin 1928 a young physicist paul dirac wrote equations that predicted the existence of antimatter dirac showed that every type of particle has a twin exactly identical but of opposite charge as dirac saw it the electron and the positron are mirror images of each other with all the same properties they would behave in exactly the same way whether in realms of matter or antimatter it became clear though that ours is a matter universe the apollo astronauts went to the moon and back never once getting annihilated solar cosmic rays proved to be matter not antimatterit stands to reason that when the universe was more tightly packed that it would have experienced an quotannihilation catastrophequot that cleared the universe of large chunks of the stuff unless antimatter somehow became separated from its twin at birth and exists beyond our field of view scientists are left to wonder: why do we live in a matter-dominated universe |
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when will time end
Bookmarked 781 weeks ago it now seems that our entire universe is living on borrowed time how long it can survive depends on whether stephen hawking039s theory checks out special thanks to ivan bridgewater for use of footagetime is flying by on this busy crowded planet as life changes and evolves from second to second and yet the arc of human lifespan is getting longer: 65 years is the global average way up from just 20 in the stone age modern science however provides a humbling perspective our lives indeed the life span of the human species is just a blip compared to the age of the universe at 137 billion years and counting it now seems that our entire universe is living on borrowed time and that even it may be just a blip within the grand sweep of deep time scholars debate whether time is a property of the universe or a human invention what039s certain is that we use the ticking of all kinds of clocks from the decay of radioactive elements to the oscillation of light beams to chart and measure a changing universe to understand how it works and what drives it our own major reference for the passage of time is the 24-hour day the time it takes the earth to rotate once well it039s actually 23 hours 56 minutes and 41 seconds approximately if you039re judging by the stars not the sun earth acquired its spin during its birth from the bombardment of rocks and dust that formed it but it039s gradually losing that rotation to drag from the moon039s gravitythat039s why in the time of the dinosaurs a year was 370 days and why we have to add a leap second to our clocks about every 18 months in a few hundred million years we039ll gain a whole hourthe day-night cycle is so reliable that it has come to regulate our internal chemistrythe fading rays of the sun picked up by the retinas in our eyes set our so-called quotcircadian rhythmsquot in motion that039s when our brains begin to secrete melatonin a hormone that tells our bodies to get ready for sleep long ago this may have been an adaptation to keep us quiet and clear of night-time predatorsfinally in the light of morning the flow of melatonin stops our blood pressure spikes body temperature and heart rate rise as we move out into the worldover the days and years we march to the beat of our biologybut with our minds we have learned to follow time039s trail out to longer and longer intervalsphilosophers have wondered does time move like an arrow with all the phenomena in nature pushing toward an inevitable endor perhaps it moves in cycles that endlessly repeat and even perhaps restore what is there we know from precise measurements that the earth goes around the sun once every 365256366 days as the earth orbits with each hemisphere tilting toward and away from its parent star the seasons bring on cycles of life birth and reproduction decay and death only about one billionth of the sun039s energy actually hits the earth and much of that gets absorbed by dust and water vapor in the upper atmosphere what does make it down to the surface sets many planetary processes in motion you can see it in the annual melting and refreezing of ice at the poles the ebb and flow of heat in the tropical oceansthe seasonal cycles of chlorophyll production in plants on land and at sea and in the biosphere at largethese cycles are embedded in still longer earth cycles ocean currents for example are thought to make complete cycles ranging from four to around sixteen centuriesmoving out in time as the earth rotates on its axis it completes a series of interlocking wobbles called milankovic cycles every 23 to 41000 years they have been blamed for the onset of ice ages about every one hundred thousand years then there039s the carbon cycle it begins with rainfall over the oceans and coastal waves that pull carbon dioxide into the sea |
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the 039supernova of a generation039
Bookmarked 760 weeks ago thunderf00t on twitter:http:twittercomthunderf00tthunderf00t blog at:http:thunderf00torg039supernova of a generation039http:wwwgeekcomarticlesgeek-ceteraastronomers-discover-the-supernova-of-a-generation-20110827there is a supernova in m101 a relatively nearby galaxy some 20 million light years away the galaxy is quite bright and in the constellation of ursa major the great bear or big dipper now by pure chance i had taken a picture of m101 about a month ago so the position of the supernova can be easily seen further i was out there last night basically doing the same thing again and i could actually see it 039live at the eyepiece039 with my 11in schmidt cassigrain however eyes are fairly sensitive to this sort of thing and it039s likely that it will be a while yet before i can get 039video039 of this at the eyepiece however i have got a 039deep sky039 video camera that should do the joband yup figure im going to have a go at doing a time lapse on this one the problem with time lapse of the sky is things tend to be a long way away so they have to move a long way for you to see anything practically that means there ain039t much you can do especially if you only have 8 hrs of dark i039ve already had a go at the moon jupiter and uranus but this is a golden opportunity the chance to do a timelapse of a distant galaxy by some reckoning this is a once in generation supernovaall this material is available under a creative commons attribution share alike license attribution thunderf00t |
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super close game - mtwsupernova vs vortix - tvz - antiga shipyard - starcraft 2
Bookmarked 709 weeks ago hello guys i am a korean starcraft 2 player who is casting games for fun please support me by subscribing you won039t regret it : |
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creator vs select - game 1 - ipl toc wr2 - starcraft 2
Bookmarked 730 weeks ago creator vs select in game 1 on cloud kingdom for this ipl tournament of champions wr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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creator vs select - game 4 - ipl toc wr2 - starcraft 2
Bookmarked 730 weeks ago creator vs select in game 3 on daybreak for this ipl tournament of champions wr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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select vs kas - game 3 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago select vs kas in game 3 on cloud kingdom for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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creator vs select - game 3 - ipl toc wr2 - starcraft 2
Bookmarked 730 weeks ago creator vs select in game 3 on metropolis for this ipl tournament of champions wr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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select vs kas - game 1 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago select vs kas in game 1 on daybreak for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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gumiho vs supernova - game 4 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago gumiho vs supernova in game 4 on cloud kingdom for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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select vs kas - game 2 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago select vs kas in game 2 on antiga shipyard for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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gumiho vs supernova - game 5 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago gumiho vs supernova in game 5 on antiga shipyard for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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gumiho vs supernova - game 2 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago gumiho vs supernova in game 2 on tal039darim altar for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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gumiho vs supernova - game 1 - ipl toc lr2 - starcraft 2
Bookmarked 730 weeks ago gumiho vs supernova in game 1 on daybreak for this ipl tournament of champions lr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |
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creator vs select - game 2 - ipl toc wr2 - starcraft 2
Bookmarked 730 weeks ago creator vs select in game 2 on antiga shipyard for this ipl tournament of champions wr2 matchhttp:igncomiplhttp:twittercomignproleaguehttp:facebookcomignproleaguehttp:twitchtvignproleaguehttp:youtubecomignproleague |