How can a captured planet ever maintain a stable, almost perfectly circular orbit around the Sun, at a plane that almost exactly matches the rest of the planets? It's impossible. The only way this can be explained is if all the planets were created together at the same time.
Could the Earth be an evaporated gas giant planet?
61–70 of 106 posts
Re: Could the Earth be an evaporated gas giant planet?
#62Earlier quoted context omitted.
Earth atmosphere is 0.04% CO2. Why does Earth have such little CO2? Is maybe used by life on early Earth?
Yes. Earth used to have a lot more CO2. Then photosynthesis in the oceans created an oxygen crisis.
"The cyanobacteria producing the oxygen caused the event which enabled the subsequent development of multicellular forms." Seems like it was ultimately a win.
Re: Could the Earth be an evaporated gas giant planet?
#63"It is not apparent yet that such Rogue planets are regularly traded between star-systems and subsequently participate in serial evaporative events and the proposal may seem like a long shot, but on astronomical time scales the unlikely can become commonplace." It sounds a bit Velikofskian.
Yes, Michael Lund of CalTech updated the Velikofskian hypothesis: https://arxiv.org/pdf/1903.12437.pdf
Best part:
> We note, however, that if a significant fraction of these ejections involve hypervelocity planets, then the number still inthe galaxy may be notably reduced as these bodies would be traveling in excess of galactic escape velocities, and so could become inter-galactic planetary bodies (Beastie Boys, 1998).
Re: Could the Earth be an evaporated gas giant planet?
#64A planet formed in another star system would very likely have very different isotope ratios than one formed here. Earth has very similar isotope ratios for most elements to meteorites.
Re: Could the Earth be an evaporated gas giant planet?
#65How do planets migrate?
Through the atoms of progenitor stars long since gone supernova. Probably neutron stars too! Or also by chance?
I know tidal curves have increase the moons orbit, I’m struggling to think of anything (outside massive collisions) that would cause planets to move closer to their stars, or move to new ones.
Re: Could the Earth be an evaporated gas giant planet?
#66Earlier quoted context omitted.
The fact that the paper uses “CalTech” was the big clue for me. Also check out the references at the end. Some big clues there too.
Some really raging clues there: https://www.youtube.com/watch?v=lcHy8xEt2QI
That video cuts off the best part, where he says "Godspeed".
Re: Could the Earth be an evaporated gas giant planet?
#67Earlier quoted context omitted.
Through the atoms of progenitor stars long since gone supernova. Probably neutron stars too! Or also by chance?
I know tidal curves have increase the moons orbit, I’m struggling to think of anything (outside massive collisions) that would cause planets to move closer to their stars, or move to new ones.
Orbits can be quite unstable, for example read (one theory) or the early dynamics of the solar system: https://en.wikipedia.org/wiki/Nice_model
Re: Could the Earth be an evaporated gas giant planet?
#68Earlier quoted context omitted.
> SAP: all universes must satisfy the preconditions for life because cogito ergo sum -- the definition of existence requires life to perceive it. Rather than cogito ergo sum , I think esse est percipi is the more appropriate phrase to use here.
I had to look that one up: esse est percipi: to be is to be perceived
I love how terse Latin is
Re: Could the Earth be an evaporated gas giant planet?
#69How can a captured planet ever maintain a stable, almost perfectly circular orbit around the Sun, at a plane that almost exactly matches the rest of the planets? It's impossible. The only way this can be explained is if all the planets were created together at the same time.
This argument seals the deal. The probability of getting that just right is vanishingly small.
Re: Could the Earth be an evaporated gas giant planet?
#70Earlier quoted context omitted.
The principle is: the universe has been fine-tuned in order to ensure that life arises. 1. The only forms of life that we know about are on a planet with plentiful water and carbon dioxide. 2. Planetary dynamics may favor the production of such planets by the evaporation of gas giants. Ergo, the rules of planetary dynamics appear to favor habitats for life as we know it. This appearance may be just an artifact of our…
I think you may be mixing up the causation. How probable our universe is, we'll never know (until we can see other universes). We do know that in this universe, life exists. Thus our universe has to be "fine-tuned" for us to exist because we do. As for the universe "favor"ing life, that doesn't really make sense either. I think it's safe to say the universe favors stars, gas giants, black holes but it's pretty hard t…
> Thus our universe has to be "fine-tuned" for us to exist because we do.
Because we of course do not exist in this universe because we're fine tuned to exist in it.
I can't think of a better way to describe it than the late Douglas Adams did :
“This is rather as if you imagine a puddle waking up one morning and thinking, 'This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!' This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.”