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Galaxy
I heard if every star in our Galaxy was a grain of salt, it would fill an
Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? LJ |
#2
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Until we either have better space telescopes or we can go see for ourselves,
we will not be sure about all the stars having planets, there's a good section of the galaxy we can't view but only in radio and infered because it's the otherside of the central area. And the last guess I read on the number of stars in our galaxy puts it at 300 billion. of that there's about 25^10 G class stars and They could habbor Earth type planets. "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? LJ |
#3
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Until we either have better space telescopes or we can go see for ourselves,
we will not be sure about all the stars having planets, there's a good section of the galaxy we can't view but only in radio and infered because it's the otherside of the central area. And the last guess I read on the number of stars in our galaxy puts it at 300 billion. of that there's about 25^10 G class stars and They could habbor Earth type planets. "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? LJ |
#4
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Lets see how big this grain would be.
A little reverse engineering is called for here. Such a pool is 50m x 25m x 2m = 2,500 cubic metres or a volume 3v2,500 that is a 13.57 metre cube. Or 13572088.08297 millimetres on each side which therefore equals = 2,500,000,000,000,000,000,000 cubic millimetres. I think a grain of salt is at least 5 per mm? Plug that in and the number of grains of salt you can get in an Olympic size swimming pool is 1.953125e+66 Hmmmm that written out long hand is about... 195,312,500,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,000,000,000,000 On the other hand if you think 5 to 1 is too small then lets try 1 to 1. Is a grain of salt 1 mm across? Hey just googled it and the average size of a grain of salt is 2mm The correct number is 1.25e+65 12,500,000,000,000,000,000,000,000,000,000,000,000 ,000,000,000,000,000,000,000,000,000 More than 10 times smaller than the first but many many times more than all the stars in this Universe! Stars in Universe: 90,000,000,000,000,000,000,000 In other words = Ninety million million billion which is a handy amount. But I reckon I'd have used this many salt grains myself already So it is a load of crap LJ! Regards Robert "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? LJ --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.705 / Virus Database: 461 - Release Date: 13/06/2004 |
#5
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Lets see how big this grain would be.
A little reverse engineering is called for here. Such a pool is 50m x 25m x 2m = 2,500 cubic metres or a volume 3v2,500 that is a 13.57 metre cube. Or 13572088.08297 millimetres on each side which therefore equals = 2,500,000,000,000,000,000,000 cubic millimetres. I think a grain of salt is at least 5 per mm? Plug that in and the number of grains of salt you can get in an Olympic size swimming pool is 1.953125e+66 Hmmmm that written out long hand is about... 195,312,500,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,000,000,000,000 On the other hand if you think 5 to 1 is too small then lets try 1 to 1. Is a grain of salt 1 mm across? Hey just googled it and the average size of a grain of salt is 2mm The correct number is 1.25e+65 12,500,000,000,000,000,000,000,000,000,000,000,000 ,000,000,000,000,000,000,000,000,000 More than 10 times smaller than the first but many many times more than all the stars in this Universe! Stars in Universe: 90,000,000,000,000,000,000,000 In other words = Ninety million million billion which is a handy amount. But I reckon I'd have used this many salt grains myself already So it is a load of crap LJ! Regards Robert "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? LJ --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.705 / Virus Database: 461 - Release Date: 13/06/2004 |
#6
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Good to know. But surely there isn't 300 Billion stars in our galaxy.
If so, half of them half at least 1 planet orbiting them, that means there's potentially 150 Billion planets in our Galaxy. I'm quoting this from http://imagine.gsfc.nasa.gov/docs/as...s/021127a.html "In 1999 the Hubble Space Telescope estimated that there were 125 billion galaxies in the universe, and recently with the new camera HST has observed 3,000 visible galaxies, which is twice as much as they observed before with the old camera. We're emphasizing "visible" because observations with radio telescopes, infrared cameras, x-ray cameras, etc. would detect other galaxies that are not detected by Hubble. As observations keep on going and astronomers explore more of our universe, the number of galaxies detected will increase" That's a whole lot of planets. LJ |
#7
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Good to know. But surely there isn't 300 Billion stars in our galaxy.
If so, half of them half at least 1 planet orbiting them, that means there's potentially 150 Billion planets in our Galaxy. I'm quoting this from http://imagine.gsfc.nasa.gov/docs/as...s/021127a.html "In 1999 the Hubble Space Telescope estimated that there were 125 billion galaxies in the universe, and recently with the new camera HST has observed 3,000 visible galaxies, which is twice as much as they observed before with the old camera. We're emphasizing "visible" because observations with radio telescopes, infrared cameras, x-ray cameras, etc. would detect other galaxies that are not detected by Hubble. As observations keep on going and astronomers explore more of our universe, the number of galaxies detected will increase" That's a whole lot of planets. LJ |
#8
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In message , EvolBob
writes "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? Lets see how big this grain would be. A little reverse engineering is called for here. Such a pool is 50m x 25m x 2m = 2,500 cubic metres or a volume 3v2,500 that is a 13.57 metre cube. Or 13572088.08297 millimetres on each side which therefore equals = 2,500,000,000,000,000,000,000 cubic millimetres. I think a grain of salt is at least 5 per mm? Plug that in and the number of grains of salt you can get in an Olympic size swimming pool is 1.953125e+66 Hmmmm that written out long hand is about... 195,312,500,000,000,000,000,000,000,000,000,000,0 00,000,000,000,000,000, 000,000,000,000 On the other hand if you think 5 to 1 is too small then lets try 1 to 1. Is a grain of salt 1 mm across? Hey just googled it and the average size of a grain of salt is 2mm The correct number is 1.25e+65 12,500,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,0 00,000,000,000 More than 10 times smaller than the first but many many times more than all the stars in this Universe! Stars in Universe: 90,000,000,000,000,000,000,000 In other words = Ninety million million billion which is a handy amount. How on Earth do you get 10^66? I cubic meter is 1000 x 1000 x 1000 cubic mm, or 10^9. 2500 cubic meters is therefore 2500 x 10^9 or 2.5 x 10^12. It's still a lot more than the number of stars in the galaxy (Lloyd's figure sounds right) but it's nowhere near the number in a million galaxies, for instance. -- What have they got to hide? Release the Beagle 2 report. Remove spam and invalid from address to reply. |
#9
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In message , EvolBob
writes "Lloyd Jones" wrote in message ... I heard if every star in our Galaxy was a grain of salt, it would fill an Olympic size swimming pool. and that there's 100 Billion stars in our Galaxy and there's a good chance that about 50 % of them have planets orbiting them. Anyone know if this is true, or a load of crap? Lets see how big this grain would be. A little reverse engineering is called for here. Such a pool is 50m x 25m x 2m = 2,500 cubic metres or a volume 3v2,500 that is a 13.57 metre cube. Or 13572088.08297 millimetres on each side which therefore equals = 2,500,000,000,000,000,000,000 cubic millimetres. I think a grain of salt is at least 5 per mm? Plug that in and the number of grains of salt you can get in an Olympic size swimming pool is 1.953125e+66 Hmmmm that written out long hand is about... 195,312,500,000,000,000,000,000,000,000,000,000,0 00,000,000,000,000,000, 000,000,000,000 On the other hand if you think 5 to 1 is too small then lets try 1 to 1. Is a grain of salt 1 mm across? Hey just googled it and the average size of a grain of salt is 2mm The correct number is 1.25e+65 12,500,000,000,000,000,000,000,000,000,000,000,00 0,000,000,000,000,000,0 00,000,000,000 More than 10 times smaller than the first but many many times more than all the stars in this Universe! Stars in Universe: 90,000,000,000,000,000,000,000 In other words = Ninety million million billion which is a handy amount. How on Earth do you get 10^66? I cubic meter is 1000 x 1000 x 1000 cubic mm, or 10^9. 2500 cubic meters is therefore 2500 x 10^9 or 2.5 x 10^12. It's still a lot more than the number of stars in the galaxy (Lloyd's figure sounds right) but it's nowhere near the number in a million galaxies, for instance. -- What have they got to hide? Release the Beagle 2 report. Remove spam and invalid from address to reply. |
#10
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In message , Lloyd Jones
writes Good to know. But surely there isn't 300 Billion stars in our galaxy. It does seem to be the accepted number. Most places seem to quote 100 billion, but http://www.physics.gmu.edu/classinfo/astr103/CourseNotes/str_hr.htm goes for 400 billion. That might even be an underestimate. I gather they are finding more red dwarfs than expected, and the total mass of the galaxy is a lot more than 100 billion suns. |
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