Re: [Vo]:planetary formation
In reply to Jürg Wyttenbach's message of Fri, 8 Jan 2021 18:04:17 +0100: Hi, I agree with this. I would add, that as consequence of the heavier bodies moving outward, only the gas was left in the middle, where it eventually condensed enough to form a star. IOW the planets formed first, then the Sun eventually grew and ignited in the center. Planetary formation removed almost all of the heavier elements from the cloud. Note also that at the temperature of deep space with no star yet present, only helium and possibly hydrogen (and maybe H*-H*?) are gasses, everything else is a solid. >One simple explanation is density. Given same size the more dense >planets are more outwards. The problem are the gas planets, but e.g. >Jupiter is way more massive what explains its position. Further upon >formation most planetary system are dual star systems and certainly >there is a complex evolution process until are orbits reach so called >resonant stages. > > > For people that want to learn by doing: Just load a centrifuge with >different material an look what happens! > > > >J.W. > > > >On 08.01.2021 14:55, ROGER ANDERTON wrote: >> >>1) If both the Sun and the planets formed from the same gas/dust >> cloud, how come the Sun is mostly Hydrogen and the >> Earth is a rocky planet?<< >> >> >> one theory/hypothesis/speculation is that there were supermassive >> stars (that have lived out their lives and died) in early universe >> where the heavier elements than hydrogen were manifactured and the >> remants of that were what formed rocky planets. While planets like >> Jupiter are just failed stars that weren't quite massive enough to >> start nuclear fusion >> >> >> >>2) If some selection process caused primarily Hydrogen to condense >> at the middle, why are the rocky planets closer to >> the Sun than the gas giants?<< >> >> >> happenstance. Dragoslav explains planet density and their distances by >> update of Bode's law to Boscovich theory of repulsive and attractive >> forces for solar system >> https://www.researchgate.net/publication/281489710_ROGER_BOSCOVICH_-_THE_FOUNDER_OF_MODERN_SCIENCE >> >> >> >> >> >> >> >> >> -- Original Message -- From: "Robin" >> To: "VORTEX" >> Sent: Friday, 8 Jan, 21 At 04:51 Subject: >> [Vo]:planetary formation Hi, Questions: 1) If both the Sun and the >> planets formed from the same gas/dust cloud, how come the Sun is >> mostly Hydrogen and the Earth is a rocky planet? 2) If some >> selection process caused primarily Hydrogen to condense at the >> middle, why are the rocky planets closer to the Sun than the gas >> giants? Regards, R. van Spaandonk Crops, not towns, should be >> planted on floodplains. Even the ancient Egyptians knew this. >>
Re: [Vo]:planetary formation
One simple explanation is density. Given same size the more dense planets are more outwards. The problem are the gas planets, but e.g. Jupiter is way more massive what explains its position. Further upon formation most planetary system are dual star systems and certainly there is a complex evolution process until are orbits reach so called resonant stages. For people that want to learn by doing: Just load a centrifuge with different material an look what happens! J.W. On 08.01.2021 14:55, ROGER ANDERTON wrote: >>1) If both the Sun and the planets formed from the same gas/dust cloud, how come the Sun is mostly Hydrogen and the Earth is a rocky planet?<< one theory/hypothesis/speculation is that there were supermassive stars (that have lived out their lives and died) in early universe where the heavier elements than hydrogen were manifactured and the remants of that were what formed rocky planets. While planets like Jupiter are just failed stars that weren't quite massive enough to start nuclear fusion >>2) If some selection process caused primarily Hydrogen to condense at the middle, why are the rocky planets closer to the Sun than the gas giants?<< happenstance. Dragoslav explains planet density and their distances by update of Bode's law to Boscovich theory of repulsive and attractive forces for solar system https://www.researchgate.net/publication/281489710_ROGER_BOSCOVICH_-_THE_FOUNDER_OF_MODERN_SCIENCE -- Original Message -- From: "Robin" To: "VORTEX" Sent: Friday, 8 Jan, 21 At 04:51 Subject: [Vo]:planetary formation Hi, Questions: 1) If both the Sun and the planets formed from the same gas/dust cloud, how come the Sun is mostly Hydrogen and the Earth is a rocky planet? 2) If some selection process caused primarily Hydrogen to condense at the middle, why are the rocky planets closer to the Sun than the gas giants? Regards, R. van Spaandonk Crops, not towns, should be planted on floodplains. Even the ancient Egyptians knew this. -- Jürg Wyttenbach Bifangstr. 22 8910 Affoltern am Albis +41 44 760 14 18 +41 79 246 36 06
Re: [Vo]:planetary formation
1) If both the Sun and the planets formed from the same gas/dust cloud, how come the Sun is mostly Hydrogen and the Earth is a rocky planet?<< one theory/hypothesis/speculation is that there were supermassive stars (that have lived out their lives and died) in early universe where the heavier elements than hydrogen were manifactured and the remants of that were what formed rocky planets. While planets like Jupiter are just failed stars that weren't quite massive enough to start nuclear fusion 2) If some selection process caused primarily Hydrogen to condense at the middle, why are the rocky planets closer to the Sun than the gas giants?<< happenstance. Dragoslav explains planet density and their distances by update of Bode's law to Boscovich theory of repulsive and attractive forces for solar system https://www.researchgate.net/publication/281489710_ROGER_BOSCOVICH_-_THE_FOUNDER_OF_MODERN_SCIENCE -- Original Message -- From: "Robin" To: "VORTEX" Sent: Friday, 8 Jan, 21 At 04:51 Subject: [Vo]:planetary formation Hi, Questions: 1) If both the Sun and the planets formed from the same gas/dust cloud, how come the Sun is mostly Hydrogen and the Earth is a rocky planet? 2) If some selection process caused primarily Hydrogen to condense at the middle, why are the rocky planets closer to the Sun than the gas giants? Regards, R. van Spaandonk Crops, not towns, should be planted on floodplains. Even the ancient Egyptians knew this.
