What is the make-up of a comet?
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Comets are sometimes called "dirty snowballs" because of their makeup.  A large portion of a comet is ice, but not just water ice.  It includes ices of ammonia, carbon dioxide, and methane, in addition to water.  A comet is also partially rocky in the form of very fine dust that is mixed in with the ice.
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Space detritus misses us constantly.  There's a near miss every 3 weeks or so (on average).  Thing is, the universe is mercifully large, and what is deemed CLOSE is close in terms of the size of our galaxy, but the odds of us being actually struck are low.  \n\nInteresting fact:  Hailey's Comet it supposedly going to finish it's fall in Iowa, some 3 million years from now.  Watch out!
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The link below has great overview info and statistics (including density) for all the planets, asteroids, comets, etc. \n\nCheck it out!
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stars are the bodies that emits energy & radiations\nplanets r the bodies that do not enits radiations but orbits around a star\nthere r other cases for nebulas,asteroides,comets....
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Shoemaker-Levy 9. Hubble telescope took more pictures. Due to the gravity of Jupiter, the comet broke into several pieces and in July 1994 collided with Jupiter. The fragments speed was about 60 Km/s.
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The image depicts the first moments after Deep Impact's probe interfaced with comet Tempel 1. The illuminated -- and possibly incandescent -- debris is expanding from the impact site. The rough-hewn edges at the top and bottom of the flash are a result of light given off at impact saturating some of the pixels in the camera's imager. The pixels "bleed" excess electronic charge onto adjacent pixels in the same column. \n\nProbably not testing weapons, at least no in this scenario.
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Uhh... it wasn't a comet that hit Saturn's moon and made the rings...\nThe rings came from the creation of our solar system, when the gravity of the dense gas of Saturn pulled some rocks, gas, dust, and ice close to it, but not close enough to fall into its core. Unfortunately, the Sun's infrared rays were not able to hit and melt these rocks, gas, dust, and ice, so they just accumulated and formed rings.
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Most asteroids are made of rock and metal, not ice.  Comets, on the other hand usually do contain “dirty ice.”\nIndeed comets are being “freeze dried” in space, but it is when they approach the sun that the ice begins to melt forming the coma and tail of the comet.\nThe reason that comets do not completely “freeze dry” in space is due to their size.  Freeze drying only occurs on the outside of the comet, not on the inside.\nSee the site below for more details:
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a meteor is headed toward earth so it hits the atmosphere, so you never see it again. the comet orbits the sun, so it does not burn up. the reason it does not burn up when it gets to close to the sun is because it orbits it, it does not crash into it.
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It's sounds like pretty average conditions though I don't know what upper comet means but you neglected to mention is there was snow. There has to be a nice thick layer of snow to ride.
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According to Newton's Laws, and object in motion stays in motion.  So once the comet gets going, it's going to keep on going forever, with nothing required to maintain it's speed.  How does it get going to start with?  You'll need to find out exactly how comets are formed to answer that.
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There is not a speciic comet that you will be able to see soon. Expect some meteor showers to be coming in your area. A good site that I recommend is: www.heavens-above.com
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You know you can find this stuff with google, right?\nHalley's Comet is about 1/10 of one percent the diameter of Earth, although it isn't really round. Its density is about 55 times less than Earth which would make it's mass about 0.000000002% of Earth.
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They are made of hydrogen.  There's so much gravity at the core of a star that it compresses protons and electrons from other hydrogen atoms and fuses into helium.  The reaction produces a tremendous amount of energy that we see as light.
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I'm guessing ... a comet? Hale-Bopp or Halley's.\n\nguessing again .... sun and planets in a straight line?  or maybe Conjunction of four of the planets?\n\nCan I phone a friend? Ask the Audience? \n\nTry Google or Wikipedia with these: 'comet' or 'conjunction'.\n\n4th grade! Sheesh ... that's more like the $500,000 question on Who Wants To Be a Millionaire.  Even then, you get to choose one out of 4.
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That would be Halley's comet. I remember seeing it - very blurredly - in 1986.\n\nA bit of background info on the comet it's been known since at least 240 BC and possibly since 1059 BC. Its most famous appearance was in 1066 AD when it was seen right before the Battle of Hastings. It was named after Edmund Halley, who calculated its orbit. He determined that the comets seen in 1531 and 1607 were the same object that followed a 76-year orbit. Unfortunately, Halley died in 1742, never living to see his prediction come true when the comet returned on Christmas Eve 1758. \n\nHalley's Comet Statistics\nPerihelion distance: 0.587 AU \nOrbital eccentricity: 0.967 \nOrbital inclination: 162.24° \nOrbital period: 76.0 years \nNext perihelion: 2061 \nDiameter: 16 x 8 x 8 km
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The speed of a comet can be found by observing its motion relative to background stars. First you'd need to know the comet's distance when you begin measurements. Also, the longer you observe it and gather data on its movement the more accurate will be the velocity solution.