Roshi wrote:How does a planet's liquid core form? Let's skip the part about "gas" that forms stars then the stars form pieces of rock and dust and iron (needed to form planets) when they explode. If we have billions of pieces of rock, in close proximity to one another, is gravity enough to squeeze them together and melt them? Melt most of them in fact, the Earth is mostly melted material, the crust is very thin relatively:
https://en.wikipedia.org/wiki/Lithosphere
Also, how does accretion deal with the fact that gravity does not attract stuff towards a center point, but towards the place with the most mass. That's why in theory if there was a hole through the Earth, in the middle we would be weightless.
Electro wrote:"Kepler-10c should not exist". They are so freaking arrogant! They actually thought they had figured it all out! They don't even have planet formation right! How the hell can they know anything about what planets should be like!
Hot, rocky exoplanets are the scorched cores of former gas giants
fosborn_ wrote:https://www.sciencenews.org/article/hot-rocky-exoplanets-are-scorched-cores-former-gas-giantsHot, rocky exoplanets are the scorched cores of former gas giants
Wow...
Nothing in the data suggests that they started as mini Neptunes and became stripped of their atmospheres to become hot earths. That assumption is driven by the belief that planets formed in accretion disks and they don't understand where the atmosphere has gone. A better fit for the data is that these suns "birthed" the hot earths and as they aged and expanded and moved away from the sun, an atmosphere has been created by the planet itself.D_Archer wrote:fosborn_ wrote:https://www.sciencenews.org/article/hot-rocky-exoplanets-are-scorched-cores-former-gas-giantsHot, rocky exoplanets are the scorched cores of former gas giants
Wow...
Indeed wow, they could no longer uphold the idea that an Earth size planet formed as is, it must have been a mini Neptune before, that based on observations with increasing accuracy of the size of these worlds, see image above.
Regards,
Daniel
better fit for the data is that these suns "birthed" the hot earths and as they aged and expanded and moved away from the sun, an atmosphere has been created by the planet itself
fosborn_ wrote:better fit for the data is that these suns "birthed" the hot earths and as they aged and expanded and moved away from the sun, an atmosphere has been created by the planet itself
I rather favor this threads primis, of just being the end stage of a star's existance. This seems a more conventional approach. Even though it's been a while sence I tracked the discussion here. When I saw this article, I thought of Jeffrey 's theory and what influence it may be having.
Star birthing planets counts on a controlled explosion, seems like a long shot to me.
Lloyd wrote:Hot, rocky exoplanets are the scorched cores of former gas giants
https://www.sott.net/article/366266-Hot-rocky-exoplanets-are-the-scorched-cores-of-former-gas-giants
Lloyd wrote:
Hot, rocky exoplanets are the scorched cores of former gas giants
https://www.sott.net/article/366266-Hot ... gas-giants
If all the planets, and maybe some moons, in the solar system now were once big old suns, like the one that is still left; where is all that inconceivably vast amount of mass that was "stripped off" to be found now ??
btw, The "third rock from the sun" is not a big rock, it just has a very, very, very thin rocky crust.
Nobody knows for sure what is in the center 99% of the globe,
be it nebula, star, 'gas giant' or planet. -ss
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