Meteor Definition and 101 Threads

METEOR (Metric for Evaluation of Translation with Explicit ORdering) is a metric for the evaluation of machine translation output. The metric is based on the harmonic mean of unigram precision and recall, with recall weighted higher than precision. It also has several features that are not found in other metrics, such as stemming and synonymy matching, along with the standard exact word matching. The metric was designed to fix some of the problems found in the more popular BLEU metric, and also produce good correlation with human judgement at the sentence or segment level. This differs from the BLEU metric in that BLEU seeks correlation at the corpus level.

Results have been presented which give correlation of up to 0.964 with human judgement at the corpus level, compared to BLEU's achievement of 0.817 on the same data set. At the sentence level, the maximum correlation with human judgement achieved was 0.403.[1]

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  1. B

    Did K-T extinction event meteor puncture a hole in crust at Chicxulub?

    Did the meteor or comet that struck Earth at the end of the Cretaceous punch a whole in the crust down to the mantle? If so, why isn't that part of the crust weak and showing signs of volcanism? Even if the crust wasn't punctured down to the mantle, wouldn't it still be a weak spot and show...
  2. S

    Vc versus Vcc. Meteor Calculations

    I tried posing my question by using some Latex features here, but I could work faster by using Word coupled with what I could use from Latex here. When I tried putting the material here from Word, it didn't work out, so I'm attaching a pdf of my question. The reference to IMO is the...
  3. J

    Asteroid, Meteorite, Meteoroid, or Meteor?

    So I know a meteoroid is the small thing floating in space while an asteroid is the large one. I know a meteor is the streak of light a meteoroid creates as it falls through the atmosphere and a meteorite is what remains after the impact on the Earth. Also, that meteorites can sometimes be...
  4. Andy Resnick

    How best to photograph the Lyrid meteor shower

    I'm hoping for some advice from those who know better. The Lyrid meteor shower is going to be best viewed here (North America) in the 'wee hours' of April 22 (call it 2 am). Since I'm not a vampire, I'd like to make a plan now in order to prevent making a stupid mistake due to being mostly...
  5. S

    Computing the period of a meteor using two ways.

    Computing the period of a meteor using two ways. I'm looking at code that computes the orbit found for a meteor. It computes the period of the meteor as: a = 13.07 # semi-major axis in AU P = m.sqrt(a*a*a) # From the program which yields P = 47.2512586393 Years If I use the...
  6. J

    Did I Miss the Quadrantid Meteor Shower in Kansas on Wednesday Morning?

    From 2:00 until 4:00 Wednesday morning there will be a meteor shower in Kansas that will be visible from South Jersey. I will be out there watching Evo dodge the bigger ones. The prediction is for 100 meteors per hour and moonlight will not wash out the show.
  7. H

    Meteor Accelerating towards the Earth

    Homework Statement a 12 kg meteor experiences an acceleration of 7.2 m/s^2, when faling towards the earth. How high above the Earths surface is the meteor? Homework Equations mass of earth= 5.98x1024 kg radius of earth= 6.36x106 m g=G*MEarth/r2 r=√G*ME/g The Attempt...
  8. J

    Geminid Meteor Shower: Look Up After 10 PM EST Tonight

    Look up after 10 pm EST tonight and be sure to duck lest you get one of these grains of sand in your eye. The nearly full moon will wash out some of it, but still you should get 40 streaks an hour. I'm really looking forward to it, as we haven't had a shower in months.
  9. P

    What Causes Meteor Showers and How Can You See Them?

    On a clear, dark night, one may observe the sky and see a few bright streaks of light across the vast dome of the sky. These are what we astronomers call meteors, more commonly called "shooting stars." Meteors are not actually shooting stars, they are fragments of debris falling at high speeds...
  10. S

    Hypothetical question: Meteor hitting Earth

    If there was a Meteor traveling at around 25,000 mph and was about 1km wide that hit Nevada, would that take out the whole state? And how much debris would be floating about the atmosphere? How long does that stuff block the sun out? And also, would that debris travel in a certain...
  11. F

    How high above the the earth's surface is the meteor?

    a 12 kg meteor experiences an acceleration if 7.2 m/s^2. when falling towards the earth a: how high above the the Earth's surface is the meteor? b: what force will a 30 kg meteor experience at the same altitude? attempt: i'm, not sure which equation to use..would it be v= sqrt(Gm/r)?
  12. P

    How much force would a 4 kg meteor impact earth with?

    If a meteor entered the Earth's atmosphere at 11 or so km/sec and impacted the Earth with a direct hit (by impact time it is 4 kg), what would the force of impact be? I only need a rough answer.
  13. S

    Meteor radiant angle. Is this computation right?

    I've written a Python program to simulate a meteor falling into the Earth's atmosphere. It's fairly straightforward. I give it the lat/long of two observing stations, and the lat/lng where the meteor begins along with an angle from north for the direction. An initial height above the beginning...
  14. H

    Meteor Showers: Exploring the Celestial Phenomenon

    How do meteor showers happen?
  15. R

    Apocalypse sized meteor. How big and speed?

    I'm pondering right now how to design a bunker that would have the greatest chance to withstand apocalypse First I need to know: -How fast does the meteor have to be to wipe out 99% of all life on the earth -How deep does the meteor dig and what magnitude Earth tremors and what speed...
  16. S

    Computing Meteor Trajectory from Data for Two Stations?

    I'd like to compute a meteor trajectory from data gathered by two video camera. One method I've recently considered but do not know much about it is to treat the meteor as an Earth satellite in a circular orbit. Once a great circle plane is found, then one could produce a ground track by...
  17. T

    Vulnerability of Space Shuttle to Impact by Meteor

    I have wondered how vulnerable is the Space Shuttle to an impact by a small meteor. If a golf ball sized or even a marble sized meteor struck the shuttle, isn't there a very strong possibility of puncturing the shuttle? Would a small hole in the shuttle be catastrophic, causing all the air to...
  18. D

    Who Can Verify Potential Meteor Crater Discoveries in Australia?

    If I claim to have found structures that look like meteor craters on Earth, who should I go to to get them verified? The ones I've found don't appear to have been described in the literature (but you never know). If it helps, these structures are all in Australia.
  19. 7

    Unravelling the Mysteries of Meteor Showers

    First off, love the site and I use it all the time to get my mind working and I really appreciate everyone who puts the time into answer questions and contribute their two cents to questions that are, at the moment, unanswerable. My question is regarding meteor showers and what mechanisms...
  20. S

    Computing Atmospheric Trajectory of Meteor

    I'm trying to understand the mathematical methods of computing the atmospheric trajectory of a meteor for two or more stations. Ceplecha wrote a rather complete description of this in around 1987. See <http://adsabs.harvard.edu/abs/1987BAICz..38..222C>. Something of a simpler version meant for...
  21. I

    How Long Would It Take San Chai to Catch Dao Ming Xi in Meteor Garden?

    Meteor Garden Problem :( Homework Statement Hi Guys.. I am really having a trouble in physics.. :( I really can' t solve uniform accelerated motion problems correctly. Can someone help me? please.. Our teacher gave this Meteor Problem. Help Please. An unforgettable scene from “Meteor...
  22. F

    Are the Perseids meteor shower the best in recent years?

    http://en.wikipedia.org/wiki/Perseids Eyes on the sky tonight.
  23. M

    Did You See the Mason Dixon Meteor Streak Across Maryland and Pennsylvania?

    You might have heard about this story, it was on slashdot.org last week. On July 6th 2009 at 1:04 AM a fireball streaked across northern Maryland and Southern Pennsylvania. Hundreds of eye witnesses reported the meteor causing a sonic boom and shaking houses. Amateur astronomer Mike Hankey in...
  24. L

    What Causes the Green Tint in Some Meteors?

    Hello, I have a question for the astronomy people here. Last night I was outside around 10 P.M, and at one point I just happened to be staring up into the western sky when I saw one of the brightest, most beautiful meteors I have ever seen. The weird thing is that it had a faint green tint to...
  25. A

    Calculating Velocity of Meteor Rock Fragment Falling on Neptune

    Homework Statement A 1250kg meteor rock fragment is momentarily at rest at an altitude of 3000km above the surface of Neptune. Neptune has a mass of 1.03x1026kg and a radius of 2.48x107m. Determine: how much work is done on the rock by Neptunes Force of gravity as the rock falls to...
  26. D

    What Determines the Rate of Decline and Impact Force of a Meteor?

    I wonder if anyone could help me with this. What would be the rate of decline be for a meteor travleing 32,000 mph 39 degrees that weighs 1 million tons and is 80 x 100 m. And if possable what would the force of it's impact be? I am preety bad at math so I need a little help. I'm not sure...
  27. D

    Meteor Entering Orbit of a Sun (cons. energy & momentum) [very hard algebra]

    Homework Statement Alright, so I've given this guy a few cracks, and I think I'm close to it, but apparently I'm not right, so here's how it goes. Simple in concept. A meteor moves toward the solar system with speed v0 in a direction such that it would miss the sun by a distance d if it...
  28. T

    What is the Velocity of the Meteor?

    Homework Statement A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.20km, 1.20km), and 1.18 s later its has moved to point B with coordinates (6.24, 0.915). 1. Find the magnitude of its average velocity between these two points. 2. Find...
  29. T

    Calculating Average Velocity of a Meteor using Radar Coordinates

    Homework Statement A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.60 km, 1.40 km, and 1.10 s later its has moved to point B with coordinates (6.12 km, 0.900 km). Find the magnitude of its average velocity between these two points...
  30. K

    What is the entropy change of the meteor

    A 3400kg meteor (c=450 J/KgC) at 1250 degrees C falls into lake michigan, which is at a temperature of 12 degrees C. Assuming the temperature of the lake remains constant, A) What is the entropy change of the meteor as it reaches thermal equilibrium with Lake Michigan? B) What is the total...
  31. C

    Calculating Semimajor Axis of Meteor Orbit

    if i know a meter is observed at an altitude of 6km, to be traveling with an initial velocity of 20 km/s and the decelerating at a rate dv/dt=0.2km/s^2, which formula i should use to get the length of the semimajor axis of the meteor'orbit?
  32. V

    Calculating Kinetic Energy of Meteor

    Homework Statement What is the Kineti energy of a 1g (0.001kg) meteor traveling at 30,000m/s? Express your answer in Joules. Homework Equations KE=1/2MV^2 The Attempt at a Solution 1/2(.001kg)(30,000)^2 = 450000J Now since 30,000 is squared, would i have to multiply .001kg by...
  33. M

    Calculating Meteor Impact Crater Sizes

    I am trying to find an equation to figure out the ratio between the size of a falling object such as a meteor and the size of the impact crater.
  34. Ivan Seeking

    Cool Video: Meteor Hits NW Ground

    A meteor that came down in the NW this morning was caught on camera. A pilot reported seeing it hit the ground.
  35. Math Is Hard

    Witness a Meteor Shower: Griffith Observatory Sky Report

    I just saw a very bright meteor streak across the sky. I thought someone was shooting off fireworks until I remembered this.. http://www.griffithobs.org/skyreport.html I want to go out and watch some more, but it's cold outside.
  36. O

    How much energy will be released when the meteor hits Jupiter?

    Homework Statement A meteor of mass about 3.4 x 10^12 kg is heading straight for Jupiter. When it hits there will be a huge release of energy, visible her on earth. Assuming it has fallen from far away, how much energy will be released when it hits Jupiter? The radius of Jupiter is 7 x 10^7 m...
  37. B

    Meteor crash in Peru, Hundreds Ill

    http://www.telegraph.co.uk/news/graphics/2007/09/19/wperu.jpg "Eyewitnesses watched a fiery ball fall from the sky and smash into the remote Andean plain near the Bolivian border on Saturday, local media reported." "When villagers went to investigate, they encountered fetid, noxious...
  38. tony873004

    Only 1 hour to the Aurigids meteor shower (storm?)

    There's some buzz that this one may storm briefly for about 1 hour centered on about 4:30am Pacific Daylight Time (11:30 UT). That's just about 1 hour from now. So anyone whose still awake might want to peek outside. Maybe you'll see hundreds, or maybe none at all. I've seen storm...
  39. Evo

    'Great Show': Perseid Meteor Shower Peaks Sunday Night

    Don't forget, tonight is supposed to be awesome. Unfortunately civilisation has crept up on me so there is always light and my idiot neighbors keep all their outdoor lights on, so I will probably see nothing. 'Great Show': Perseid Meteor Shower Peaks Sunday Night...
  40. I

    Mystery of the Bright Green Meteor: Is it Common?

    I saw a bright green meteor yesterday. What would cause a meteor to be bright green? Is this common?
  41. wolram

    Tunguska Meteor: Global Warming Connection?

    yes this meteor is responsible for global warming. http://www.scienceagogo.com/news/tunguska.shtml
  42. Loren Booda

    Could Our DNA Carry Meteor Markers from Ancient Epochs?

    According to one estimate, our planet exposes itself to meteor showers in particular once every 26,000,000 years. Our genetic ancestors often had to adapt to the extreme conditions presented by such catastrophic potential. This included natural selection that could have passed down a special...
  43. P

    Detecting volcanic ash or meteor.

    A friend and I were sitting on this mound of dirt in a deserted work site, and I lifted up a black piece of rock. I know it is not coal, as it does not look like coal, it highly resembles volcanic ash as it is super light, but there's no volcanos here in Northern Ireland, then I thought it...
  44. W

    Linear Momentum and Collisions of meteor

    A meteor whose mass was about 10^8 kg struck the Earth (m = 6.0 X10^24 kg) with a speed of about 11 km/s and came to rest in the Earth. (a) What was the Earth's recoil speed? (m/s) (b) What fraction of the meteor's kinetic energy was transformed to kinetic energy of the Earth? (%) (c) By...
  45. M

    Twisted Meteor Train - A Sight to Behold

    I have seen this recent photo of a twisted meteor train http://antwrp.gsfc.nasa.gov/apod/ap050202.html As the image shows, the meteor followed an spiral path, I couldn't imagine that such thing was possible. Does somebody here take photos of meteors? Ever photographed a twisting path?
  46. Orion1

    Possible Meteor Explosion Near Jakarta Causes Loud Noise, No Injuries Reported

    Reference: http://www.harktheherald.com/modules.php?op=modload&name=News&file=article&sid=43167&mode=thread&order=0&thold=0
  47. S

    Calculating Impact Speed of Meteor Falling from 811 km

    A meteor has a speed of 83.0 m/s when 811 km above the Earth. It is falling vertically (ignore air resistance) and strikes a bed of sand in which it is brought to rest in 3.31 m. What is its speed just before striking the sand? So here is the formula that I have but it doesn't give me the...
  48. check

    Able to catch the meteor shower this morning

    Just wondering if anyone was able to catch the meteor shower this morning. It was cloudy and hazy in my area but some friends and I drove out to the country for a look anyway. We actually saw a few through some of the small gaps in the clouds. I bet had it been clear we would have had an awesome...
  49. Evo

    Meteor Trajectory: Can it Fall Straight Down?

    I have always thought that a meteor enters the Earth's atmosphere and impacts the ground (if it doesn't disintegrate first) at an angle. I saw something a few months ago which has bothered me ever since. I live in an area of farms, cow pastures and wilderness preserves. I was driving one...
  50. Ivan Seeking

    NASA Schoolboy's photo amazes Nasa: Flaming Meteor

    http://news.bbc.co.uk/2/hi/uk_news/wales/south_east/3155928.stm
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