tag:blogger.com,1999:blog-35187314.post3273988288134770872..comments2021-01-19T08:15:08.996-05:00Comments on Physics Buzz: HEY! I'm Orbiting Here!APS Webmasterhttp://www.blogger.com/profile/05951833208918853453noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-35187314.post-72413838864605295982009-09-23T21:45:45.594-04:002009-09-23T21:45:45.594-04:00An old thread I suppose, but perhaps you can still...An old thread I suppose, but perhaps you can still provide some feedback. <br /><br />These are back of the envelope type calculations, but you report that this kind of collision should happen about once every three million years. The fact that this has already happened once in our first 50 years of space doesn't prove anything. But the odds against it are 60,000:1.<br /><br />Also, the distribution of objects in space (with a minimum size of .1 meters) is going to be a lot closer to 1 meter than 10. That changes your results by a factor of 100, making it once every 300 million years. That changes the odds of the first 50 years including a collision to 6 billion:1.<br /><br />Based on those odds, I wonder if the equation chosen is correct. I don’t know much about molecular or orbital physics. This is just a suspicion from a non-expert. I appreciate your feedback.SchreiberBikehttp://schreiberbike.blogspot.com/noreply@blogger.comtag:blogger.com,1999:blog-35187314.post-74110921105195812282009-02-15T03:41:00.000-05:002009-02-15T03:41:00.000-05:00Radius - and not the diameter - of Earth is 6,378k...Radius - and not the diameter - of Earth is 6,378kms.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-89126770991001825202009-02-14T13:00:00.000-05:002009-02-14T13:00:00.000-05:00so what are the odds? i googled it found this site...so what are the odds? i googled it found this site.<BR/><BR/>Well I saw something funny I am in Phx AZ the date was tonight 2-13-2009 time was between 7:57 and 8:01 pm <BR/><BR/>I was looking up at the sky thinking about the satellite collision and the odds of two satellites hitting each other. Has some calculated the ODDS on that happening. Don't we spend Billions on developing technology to take down Satellites? Anyway we should stop all research because the damn things hit each other up there. Really what are the odds? Thats why I was looking at the sky tonight.<BR/><BR/><BR/><BR/>Anyway back to what I saw A Really bright object caught my attention I thought it was natural occurrence and it probably was however then I notices 2 bright objects lower than the bigger one. I thought at first I saw the two moving. Then I told myself no.. Sometime past I said something like holly sh1t they are moving. As soon as I said that a friend moved by my side but by then it was too late the objects slowly faded away. She was 10 seconds too late. It was high altitude by my estimation. The objects were close to each other with noticeable distance between the two objects... Not saying they where aliens just struck me as a little weirdAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-61150655233279176232009-02-13T11:42:00.000-05:002009-02-13T11:42:00.000-05:00That’s one small typo for man.One major change to ...That’s one small typo for man.<BR/>One major change to the end result.<BR/><BR/>Lesson learned; never check your math using Wikipedia. My original equations from yesterday were thrown off because I flipped the equation for finding the volume of a sphere from 4/3 π r^3 to 3/4 π r^3, throwing off my density calculation and as a result my final answer. The volume I should have used was 1.65348213x10^11 cubic km rather than 9.3055544x10^10. <BR/><BR/>This is a great example of the butterfly effect or how a slight difference early on can lead to a huge change farther down the line. My original volume ended up being an order of magnitudes off from the actual volume, leading to a huge difference in the final result. Originally I had a collision once every 98,518 years, a far cry from today's update. <BR/><BR/>Live and learn I suppose. Though a note to some of the more disparaging commentators (CH I’m looking at you); just remember, it is always better to light a single candle than forever curse the darkness.quantumhttps://www.blogger.com/profile/12729494934304065498noreply@blogger.comtag:blogger.com,1999:blog-35187314.post-53447997901831503282009-02-13T11:22:00.000-05:002009-02-13T11:22:00.000-05:00If all else fails, attack grammar, spelling or typ...If all else fails, attack grammar, spelling or typos. Also, I'm pretty sure CH was being charmingly sarcastic. At least I hope so.<BR/><BR/>As it is, I'm thoroughly entertained with the thought of a satellite demolition derby, so I'm just going to fudge all the math a pretend it happens waaaaay more often. At least until my cell phone service goes out. Then I'll use your math. <BR/><BR/>:)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-77682779614304454092009-02-13T07:32:00.000-05:002009-02-13T07:32:00.000-05:00Hey CH, chill. When you do an estimate like this 3...Hey CH, chill. When you do an estimate like this 3/4 and 4/3 are close enough that you can just consider them to be 1 anyway. Personally, I would have estimated the volume of a sphere to be 3 r^3, it wouldn't change the estimate enough to matter (4 r^3 would be a little better). It's called a back-of-the-envelope estimate.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-50938671417868621552009-02-13T07:24:00.000-05:002009-02-13T07:24:00.000-05:00Other than a few typos, looks like a pretty good g...Other than a few typos, looks like a pretty good guess to me. Thanks for the interesting calculation.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-40389805050045550752009-02-12T19:08:00.000-05:002009-02-12T19:08:00.000-05:00>>The pull of gravity also factors in, as tw...>>The pull of gravity also factors in, as two bodies of junk will attract one another.<BR/><BR/><BR/>Are you seriously this retarded about Newtonian physics???Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35187314.post-25934961224959105302009-02-12T19:04:00.000-05:002009-02-12T19:04:00.000-05:00V = ¾ π r^3 gives us the volume of a sphereDumbass...V = ¾ π r^3 gives us the volume of a sphere<BR/><BR/><BR/>Dumbass! You lose all credibility right there.Anonymousnoreply@blogger.com