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Dazzling Meteor Fireball Lights Up UK Night Sky | Space.com - 0 views

  • A spectacular meteor wowed stargazers across the United Kingdom Friday (Sept. 21) when it flared up and shattered into piece
  • spotted by observers across Scotland and northern England as well as Ireland
  • Many observers captured views of the meteor on camera
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  • video of the Sept. 21 meteor shows what appears to be a fireball created as a small space rock breaks apart in Earth's atmosphere. Pieces of the meteor can easily be seen separating from the main body in his view
  • many witnesses to wonder if it was sparked by a man-made piece of space junk falling out of orbit
  • experts have conclusively tied the event to a naturally occurring space rock burning up in Earth's atmosphere
  • Veteran satellite tracker Marco Langbroe
  • the fireball was definitely a meteor.
  • sighting reports to determine the fireball's trajectory and studied videos posted by witnesses to determine how long it lasted
  • ack-of-the-envelope reconstruction therefore shows that this must have been a meteoric fireball, quite likely of asteroidal origin, and we definitely can exclude a satellite re-entry
  • meteor in space is called a meteoroid. Only when it flares up in the night sky does it become a meteor. Any remains of the object that reach the ground, meanwhile, are called meteorites
  • Earlier this year, a rare daytime fireball surprised U.S. observers in California and Nevada when it unleashed a sonic boom that some mistook for a small earthquake. The meteor was caused by a minivan-size asteroid and created several meteorites that NASA retrieved in a follow-up search
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Rare Daytime Fireball Created by Minivan-Size Space Rock | Meteor & Asteroids | Space.com - 0 views

  • A meteor in the sky above Reno, Nevada on April 22, 2012.
  • The red bullseye indicates the location where a meteor exploded over California's Central Valley on April 22, 2012. The yellow triangles mark infrasound arrays, which were key in determining the location of the meteor's explosion.
  • fireball occurred just after the peak of the annual mid-April Lyrid meteor shower
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  • likely not a Lyrid meteor
  • ]ithout a trajectory, I cannot rule out a Lyrid origin, but I think it likely that it was a background or sporadic meteor
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Jupiter May Help Supercharge Orionid Meteor Shower | Halley's Comet | Space.com - 0 views

  • Jupiter's powerful gravity can help supercharge a meteor shower caused by trailing chunks of the famed Halley's comet, a new study suggests
  • Every October, skywatchers are treated to a dazzling show when the Orionid meteors — leftover bits of Halley's comet
  • The Orionids are incredibly active from time to
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  • activity is generated by a complex orbital interplay among Jupiter, the comet and the meteoroids
  • according to the study
  • Previous research had suggested that intense Orionid outbursts occur after the meteoroids fall into resonances with Jupiter's orbit
  • Resonances are gravitational sweet spots in which objects' orbits around the sun are related by a ratio of two whole numbers. (A 1:2 resonance, for example, means that one body completes one orbit in the time it takes another object to make two orbits.)
  • new study finds that Halley's comet itself has likely been in resonances with Jupiter in the
  • which in turn increases the odds of populating the Orionid stream with resonant meteoroids
  • particles ejected during those times tend to clump together due to periodic effects from Jupiter
  • modeled the orbital evolution of Halley's comet over a long stretch of time
  • from more than 12,000 years in the past to 15,000 years into the future
  • determind that from 1404 B.C. to 690 B.C., the comet was likely trapped in a 1:6 resonance with Jupiter
  • Halley completed one orbit for every six orbits of Jupiter around the sun).
  • from 240 B.C. to 1700 A.D., the comet was in a 2:13 orbital resonance with Jupiter
  • Debris deposited during these two periods are directly linked to heightened activity in the Orionid meteor showers in some years, according to the study.
  • the unusual Orionid outburst observed in 1993 was due to 2:13 resonant meteoroids sloughed by Halley around 240 B.C
  • predicts that the next similarly heightened display of meteors from this 2:13 resonance will be in 2070 A.D.
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Russian Meteor Blast Bigger Than Thought, NASA Says | Space.com - 0 views

  • 16 February 2013
  • NASA revised its estimates on the size and power of the devastating meteor explosion
  • now thought to be slightly larger — about 55 feet (17 m) wide — with the power of the blast estimate of about 500 kilotons, 30 kilotons higher than before
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  • also substantially more massive than thought
  • Initial estimated pegged the space rock's mass at about 7,000 tons
  • the meteor weighed about 10,000 tons and was travelling 40,000 mph (64,373 km/h) when it exploded
  • new estimates were generated using new data that had been collected by five additional infrasound stations located around the world
  • the first recording of the event being in Alaska, over 6,500 kilometers away
  • infrasound stations detect low-frequency sound waves that accompany exploding meteors, known as bolides
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Meteor strike in Russia hurts almost 1,000 (w/ Video) - 0 views

  • The fall of such a large meteor estimated as weighing dozens of tonnes was extremely rare
  • 950 people were injured, with two-thirds of the injuries light wounds from glass shards and other materials blown out by the shockwave
  • the ministry saying almost 300 buildings were damaged including schools, hospitals, a zinc factory and even an ice hockey stadium
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  • At 9:20 am (0320 GMT), an object was observed above Chelyabinsk which flew by at great speed and left a trail behind. Within two minutes there were two bangs," regional emergencies official Yuri Burenko
  • office of the local governor said that a meteorite had fallen into a lake outside the town of Chebarkul in the Chelyabinsk region and television images pointed to a six-metre (20-foot) hole in the frozen lake's ice
  • it has yet to be finally confirmed if meteorite fragments made contact with the Earth and there were no reports that any locals had been hurt directly by a falling piece of meteorite
  • the shock wave blew out windows amid temperatures as low as minus 18 degrees Celsius (zero degrees Fahrenheit
  • Russian Academy of Sciences
  • estimated the body to be several metres long and weighing several dozen tonnes
  • The meteor explosion appears to be one of the most stunning cosmic events above Russia since the 1908 Tunguska Event
  • With the meteor quickly a leading trend on Twitter
  • locals posted amateur footage on YouTube showing men swearing in surprise and fright, and others grinding their cars to a halt
  • virtually impossible" to spot objects such as the meteor that struck Russia, which he called a "tiny asteroid", ahead of time against a daytime sky
  • The Chelyabinsk region is Russia's industrial heartland
  • huge facilities that include a nuclear power plant and the massive Mayak atomic waste storage and treatment centre
  • radiation levels in the region also did not change and that 20,000 rescue workers had been dispatched to help the injured and locate those requiring help
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Meteorites found in Calif. along path of fireball - 0 views

  • Meteorites found in Calif. along path of fireball
  • pieces from a meteor that was probably about the size of a minivan
  • rocks came from a meteor, believed to between 4 to 5 billion years old
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  • scientists have confirmed his suspicions: it's one of the more primitive types of space rocks out there, dating to the early formation of the solar system 4 to 5 billion years ago
  • found the first piece on Tuesday along a road between a baseball field and park on the edge of Lotus near Coloma, where James W. Marshall first discovered gold in California, at Sutter's Mill in 1848.
  • Robert Ward has been hunting and collecting meteorites for more than 20 years
  • Ward, who has found meteorites in every continent but Antarctica
  • CM" - carbonaceous chondrite
  • actually has two rocks but suspects they were part of the same small meteorite that broke on impact. Each weighs about 10 grams - about the same as two nickels
  • Experts say the flaming meteor was probably about the size of a minivan when it entered the Earth's atmosphere with a loud boom and about one-third of the explosive force of the atomic bomb
  • seen from Sacramento, Calif., to Las Vegas and parts of northern Nevada.
  • event of that size might happen once a year around the world
  • most of them occur over the ocean or an uninhabited area
  • most meteors you see in the night's sky are the size of tiny stones or even grains of sand, and their trail lasts all of a second or two
  • meteor probably weighed about 154,300 pounds
  • probably released energy equivalent to a 5-kiloton explosion - the Hiroshima bomb was 15 kilotons
  • The boom, another expert said, was caused by the speed with which the space rock entered the atmosphere
  • Meteorites enter Earth's upper atmosphere at somewhere between 22,000 mph and 44,000 mph - faster than the speed of sound, thus creating a sonic boom.
  • friction between the rock and the air is so intense that "it doesn't even burn it up, it vaporizes
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Airburst Explained: NASA Addresses the Russian Meteor Explosion - 0 views

  • traveled through the atmosphere for about 30 seconds before breaking apart and producing violent airburst ‘explosion’ about 20-14 km (12-15 miles) above Earth’s surface
  • producing an energy shockwave equivalent to a 300 kilotons explosion
  • The Russian meteor is the largest reported since 1908, when a meteor hit Tunguska, Siberia
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  • Tunguska event was caused by an object about the size of 2012 DA14
  • The meteor, which was about one-third the diameter of asteroid 2012 DA14, became brighter than the Sun
  • Its trail was visible for about 30 seconds, so it was a grazing impact through the atmosphere
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February 15 - Today in Science History - Scientists born on February 15th, died, and ev... - 0 views

  • Meteor explosion over Russia with 1,000 injuries
  • In 2013, a meteor exploded in the sky over Russia's Ural Mountains. It produced a shock wave so intense that about 1,000 people were reported injured, mostly by flying glass fragments. To view the meteor streaking across the sky, many people were at their windows when the sonic boom shattered the glass panes. The meteor was estimated to ;be 2 meters in diameter, with a mass of about 10 tons. It entered the Earth's atmosphere at a hypersonic speed of at least 33,000 mph when it was viewed by residents of Chelyabinsk (a city of 1 million about 930 miles east of Moscow) at about 9:20 am local time, just after sunrise. They saw a thick, white contrail and an intense flash of light ending with a loud thundering sound as the shattering of the meteor blew apart with several kilotons of energy (equivalent to an atomic bomb)
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Giant Chunk of Russian Meteor Recovered - News Watch - 0 views

  • Russian scientists appear to have pulled up a half-ton charred meteorite from the bottom of a murky Siberian lake
  • a piece of the giant space rock that exploded in the skies above the southern Urals in February.
  • Entering the atmosphere at speeds up to 31,000 miles per hour (50,000 kilometers per hour), the Russian meteor, officially named 2011 EO40, exploded about 25 miles (40 kilometers) above the city of Chelyabinsk
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  • The power of the explosion was estimated to be at least 20 times stronger than the atomic bomb dropped on Hiroshima in 1945
  • The resulting air blast damaged buildings and injured some 1,600 people.
  • piece of meteor recovered this week weighs at least 1,257 pounds (570 kilograms).
  • , it is only a fragment of the original impactor that is estimated to have been about 17 meters (54 feet) across, with a mass of about 10,000 metric tons before it shattered
  • locals directed scientists to Lake Chebarkul—45 miles west of the city of Chelyabinsk—to a 25-foot (8-meter) hole punctured in the ice by the meteor
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Meteorite From California Fireball Is Meteor-wrong, Scientist Says | Space.com - 0 views

  • A rock thought to be a meteorite from a recent fireball seen over Northern California is in fact, just a regular Earth rock
  • Projected band (light area) where meteorites of different size may have fallen over Marin and Sonoma counties from an Oct. 17, 2012 meteor.
  • Novato, Calif. resident
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  • read about the fireball and recalled hearing a sound on her roof that night
  • she and neighbors found a ding on the roof
  • On closer inspection, that crust was a product of weathering of a natural rock, not from the heat of entry
  • Examination of the rock under a petrographic microscope quickly revealed the stone was not a meteorite
  • the ding on Webber's roof, along with her recollection of the sound she heard that night, suggest her house may in fact have been hit by a still-missing meteorite.
  • r Marin and Sonoma counties
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Big Meteorite Discovered in Antarctica | Meteorites & Antarctica | Space.com - 0 views

  • 40-pound (18 kilogram)
  • Initial tests show it is an ordinary chondrite, the most common type of meteorite found on Earth
  • This is the biggest meteorite found in East Antarctica for 25 years
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  • More than 38,000 meteorites have been found in Antarctica, but only 30 bigger than 40 pounds (18 kg).
  • The Russian meteor that burst into fragments above the Chelyabinsk region on Feb. 15 is also an ordinary chondrite
  • charred black crust stands out
  • in the
  • snow, and the cold, dry climate helps preserve any organic chemicals inside the rocks
  • The expedition collected 425 meteorites in 40 days, with a total weight of 165 pounds (75 kg).
  • they may have found one Mars meteorite and one piece of the asteroid Vesta among the many discoveries.
  • A team from Belgium and Japan discovered the
  • meteorite as the members drove across the East Antarctic plateau on snowmobiles
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Russia meteor virtually impossible to see coming | Atom & Cosmos | Science News - 0 views

  • Scientists have begun piecing together the characteristics of the meteor that exploded over Russia on the morning of February 15, using data from seismic instruments that track earthquakes and microphones designed to detect sonic booms from nuclear explosions
  • The explosion had the equivalent of up to 500,000 tons of TNT
  • about 30 times the energy output of the Hiroshima atomic bomb
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  • only 5 percent of the energy of the famous 1908 Tunguska meteor that downed trees over a 2,000-square-kilometer area in Siberia
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NASA - Asteroid 2012 DA14 - Earth Flyby Reality Check - 0 views

  • NASA statement on Russia meteor
  • the trajectory of the Russia meteor was significantly different than the trajectory of the asteroid 2012 DA14, making it a completely unrelated object
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Russian Meteor Not Related to Asteroid Flyby, NASA Confirms - 0 views

  • February 15, 2013
  • The meteor that streaked over the skies of Russia
  • not related to the asteroid that
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  • whiz past Earth later today, (Feb.15
  • the trajectory of the Russian meteorite was significantly different than the trajectory of the asteroid 2012 DA14, making it a completely unrelated object
Mars Base

Jupiter helps Halley's Comet give us more spectacular meteor displays - 0 views

  • The dramatic appearance of Halley's comet in the night sky has been observed and recorded by astronomers since 240 BC. Now a study shows that the orbital influences of Jupiter on the comet and the debris it leaves in its wake are responsible for periodic outbursts of activity in the Orionid meteor showers. The results will be presented by Aswin Sekhar at the National Astronomy Meeting in Manchester on Tuesday 27th March.
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