bevin Posted April 30, 2007 Author Share Posted April 30, 2007 I googled meteor sounds, and found this... http://www.space.com/scienceastronomy/generalscience/iridium_sound_000328.html Quote Link to comment Share on other sites More sharing options...
Administrators Gail Posted April 30, 2007 Administrators Share Posted April 30, 2007 Sounds like a party to me! I'd love to hear that! Quote Isaiah 32:17 And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. Link to comment Share on other sites More sharing options...
Amelia Posted May 1, 2007 Share Posted May 1, 2007 According to the article meteors start vaporizing at 60 miles. That is in the lower thermosphere. The article also says that in the case being discused, the meteor sound didn't occur until it was closer to the ground. Well within the troposphere. Space is silent. Quote <p><span style="color:#0000FF;"><span style="font-weight:bold;"><span style="font-style:italic;">"Do not use harmful words, but only helpful words, the kind that build up and provide what is needed, so that what you say will do good to those who hear you."</span></span> Eph 4:29</span><br><br><img src="http://banners.wunderground.com/weathersticker/gizmotimetemp_both/US/OR/Fairview.gif" alt="Fairview.gif"> Fairview Or</p> Link to comment Share on other sites More sharing options...
Taylor Posted May 1, 2007 Share Posted May 1, 2007 Thanks bevin and everyone. This was interesting! Quote Link to comment Share on other sites More sharing options...
Beryl Posted May 1, 2007 Share Posted May 1, 2007 Very interesting! Beryl Quote "Grace is God doing for us, in us and through us that which He requires of us but which is impossible for us to do in or for ourselves."Â But He said to me, "My grace is sufficient for you, for my power is made perfect in weakness." 2 Cor. 12:9. Link to comment Share on other sites More sharing options...
bevin Posted May 1, 2007 Author Share Posted May 1, 2007 Two today, one for the real geeks - what is the closest known star to our sun? http://www.astro.wisc.edu/~dolan/constellations/extra/nearest.html And one for those of us who have seen a sky with a full blaze of stars, unhidden by city lights... http://www.astro.wisc.edu/~dolan/constellations/mw/MilkyWay.html Quote Link to comment Share on other sites More sharing options...
Administrators Gail Posted May 2, 2007 Administrators Share Posted May 2, 2007 I'm not a geek, but can I guess? Antares? Quote Isaiah 32:17 And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. Link to comment Share on other sites More sharing options...
bevin Posted May 2, 2007 Author Share Posted May 2, 2007 Hey - you are following this thread, so you must be at least a geeklet :-) This is really a test of who read what Sci-Fi as a kid, because those stories often had people going to the then-closest-known star /Bevin Quote Link to comment Share on other sites More sharing options...
bevin Posted May 3, 2007 Author Share Posted May 3, 2007 So our sun regularly makes little bangs. God likes big bangs. http://imagine.gsfc.nasa.gov/docs/science/know_l2/supernovae.html http://hubblesite.org/newscenter/archive/releases/1994/22/image/a/ /Bevin Quote Link to comment Share on other sites More sharing options...
Moderators Bravus Posted May 3, 2007 Moderators Share Posted May 3, 2007 Alpha Centauri would be the closest star to our sun. (I had to read the question twice because people often ask the trick question 'which is the closest star to earth?') Quote Truth is important Link to comment Share on other sites More sharing options...
bevin Posted May 3, 2007 Author Share Posted May 3, 2007 http://www.newton.dep.anl.gov/askasci/ast99/ast99500.htm Quote: Question: What is the closest star to the sun. Some sources say Alpha Centauri and others say Proxima Centauri is the closest. Both are reliable is the closest star??? Answer: The name "Alpha Centauri" actually denotes a triple star system in the constellation Centaurus (it appears as a single star to the naked eye). Two of these stars, denoted Alpha Centauri A and B, are very similar to the Sun and are approximately 4.336 light-years away. They orbit each other (better said, they orbit their common center of mass) with a period of about 80 years. Then, orbiting this pair is a small, faint star only a tenth the size of the Sun. This star takes one-and-a-half million years to orbit the larger pair; at the moment it is closer to us than the other two, a mere 4.205 light-years away. Because it is the nearest star to the Sun, it is named Proxima (from the Latin word for "nearest") Centauri. This information came from "Astronomy: The Cosmic Journey", an astronomy text by William Hartmann. I did not know this stuff myself 'til now! Ron Winther Quote Link to comment Share on other sites More sharing options...
bevin Posted May 4, 2007 Author Share Posted May 4, 2007 http://hubblesite.org/gallery/album/nebula_collection/pr1997038g/ Nebulae are huge (bigger than solar system) clouds of gas, lit up by the stars in or near them. They have several different causes http://en.wikipedia.org/wiki/Nebula Quote: Many nebulae form from the gravitational collapse of diffuse gas in the interstellar medium or ISM. As the material collapses under its own weight, massive stars may form in the centre and illuminate the surrounding gas allowing it to be observed. An example of this type of nebula is the Rosette Nebula or the Pelican Nebula. Some nebulae are formed as the result of supernova explosions. One of the best examples of this is the Crab Nebula, in Taurus. It is the result of a recorded supernova in the year 1054. At the center of the nebula is a neutron star, created during the explosion. Other nebulae may form as planetary nebulae. Again these are created near the end of a star's life; when a star with a mass of under 1.4 solar masses becomes a red giant. An outer layer of light hydrogen gas is ejected from the star as the fusion process slows, and the star becomes unable to sustain its entire mass. A nebula is made of luminiscent gases, rock and ash. Quote Link to comment Share on other sites More sharing options...
Moderators Bravus Posted May 4, 2007 Moderators Share Posted May 4, 2007 Ah! Thanks for the Proxima Centauri info Quote Truth is important Link to comment Share on other sites More sharing options...
bevin Posted May 7, 2007 Author Share Posted May 7, 2007 "Four hundred years (09 October, 2004), a previously unseen star suddenly appeared in the night sky. Discovered on Oct. 9, 1604, it was brighter than all other stars. " "The bubble is expanding at 4 million mph" "All stars make heavy chemical elements like carbon and oxygen through a process called nuclear fusion, where lighter elements are fused together to make heavier elements. Many chemical elements heavier than iron, such as gold and uranium, are produced in the heat and pressure of supernova explosions. These heavy elements enrich the interstellar medium, providing the building blocks for stars and planets, like Earth. " http://www.space.com/php/multimedia/imagedisplay/img_display.php?pic=041006_kepler_supernova_02.jpg http://www.space.com/scienceastronomy/super_photo_041006.html Quote Link to comment Share on other sites More sharing options...
bevin Posted May 8, 2007 Author Share Posted May 8, 2007 Freaky - I had not seen this when I posted the above... http://news.yahoo.com/s/ap/20070507/ap_on_sc/supernova Quote Link to comment Share on other sites More sharing options...
bevin Posted May 9, 2007 Author Share Posted May 9, 2007 Of course, once exploding individual stars begins to lose it lustre - you can always try throwing galaxies against each other... http://csep10.phys.utk.edu/astr162/lect/galaxies/colliding.html Quote Link to comment Share on other sites More sharing options...
D. Allan Posted May 13, 2007 Share Posted May 13, 2007 Is this bigger than the one seen 400 years ago? And what is the significance of the fact that the latter one escaped becoming a black hole? Why did that happen? What is its future going to be? [puzzled] Quote dAb O frabjous day! Callooh! Callay! Link to comment Share on other sites More sharing options...
D. Allan Posted May 13, 2007 Share Posted May 13, 2007 The post I submitted just above was about the recent supernova (back on page two) The colliding galaxy pictures are neat. It took a long time for the site to load into my computer but it was worth the minute! I think I gave up the first time I tried several days ago thinking something must be wrong with the site. Oh for a cable connection! The cartwheel galaxy is amazing. Our Milkyway galaxy will collide with the Andromeda galaxy - that will be awesome!!!! Quote dAb O frabjous day! Callooh! Callay! Link to comment Share on other sites More sharing options...
bevin Posted May 14, 2007 Author Share Posted May 14, 2007 Some impacts are just the right size for us to appreciate them... http://www.cbc.ca/world/story/2006/09/12/newzealand-meteor.html http://www.mojoflix.com/Video/Meteor-Spotted.html Quote Link to comment Share on other sites More sharing options...
D. Allan Posted May 15, 2007 Share Posted May 15, 2007 It is quite a rare event to see a meteor-event like the video, I assume. Some, no doubt, would claim to have seen a UFO. Quote dAb O frabjous day! Callooh! Callay! Link to comment Share on other sites More sharing options...
bevin Posted May 15, 2007 Author Share Posted May 15, 2007 Then again, some are even more visible... http://digg.com/space/Spectacular_Meteor_Caught_on_Video_during_Football_Game Quote Link to comment Share on other sites More sharing options...
bevin Posted May 17, 2007 Author Share Posted May 17, 2007 Of course, the moon gets its share of knocks... The flash is the impact - remember, the moon has no atmosphere to cause the meteorite to start burning up before impact http://science.nasa.gov/headlines/y2006/13jun_lunarsporadic.htm Weird science question: why does the moon not have an atmosphere? /Bevin Quote Link to comment Share on other sites More sharing options...
Amelia Posted May 17, 2007 Share Posted May 17, 2007 Quote: Weird science question: why does the moon not have an atmosphere? Because it is dead? Quote <p><span style="color:#0000FF;"><span style="font-weight:bold;"><span style="font-style:italic;">"Do not use harmful words, but only helpful words, the kind that build up and provide what is needed, so that what you say will do good to those who hear you."</span></span> Eph 4:29</span><br><br><img src="http://banners.wunderground.com/weathersticker/gizmotimetemp_both/US/OR/Fairview.gif" alt="Fairview.gif"> Fairview Or</p> Link to comment Share on other sites More sharing options...
Moderators Bravus Posted May 17, 2007 Moderators Share Posted May 17, 2007 Too little gravity to hang on to the air molecules, I believe. If I'm not mistaken it does have kind of a micro-atmosphere. Yeah, here's something on it: http://www.iac.es/galeria/mrk/atmo_lun.html Quote Truth is important Link to comment Share on other sites More sharing options...
bevin Posted May 17, 2007 Author Share Posted May 17, 2007 Right - planetary atmospheres apparently are a balance between inputs and outputs inputs: material in the planet turning to gas impacting comets etc carrying water which then turns to gas solar wind and other molecules being captured outputs: the gas turning into planetary solids the gas escaping back into space Around bodies the size of our moon and smaller, the inputs are lower and the outputs are higher (easier to escape) /Bevin Quote Link to comment Share on other sites More sharing options...
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