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discord73
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What is the chance of planets forming from gas clouds without a star? has anyone calculated this? are they more likely to form than stars? could there be billions of rogue planets floating arround our galaxy?
discord73 said:Yea, I'm familiar with brown dwarfs, I was wondering about objects even smaller than brown dwarfs though. Say instead of condensing into a star system a cloud condensed into objects like earth, mars, merc and venus as well as jupiter, saturn and those. Basically a solar system without the solar part. Was just wondering what an "earth" would be like if it evolved without a stelar companion, not even a brown dwarf. Not to mention the possibility of planets that did evolve with a star but when the star "turned on" so to say and started shining, what if that initial explosion caused the planets forming with it to be ejected from that system, causing yet more "rogue planets"
I don't think you'd get rocky objects forming on their own in interstellar space. The reason why you get rocky objects in our own solar system is that the heat from the Sun has blown away most of the lighter materials, leaving behind what would otherwise be very rare rocky material (metals, silicates, and such).discord73 said:Yea, I'm familiar with brown dwarfs, I was wondering about objects even smaller than brown dwarfs though. Say instead of condensing into a star system a cloud condensed into objects like earth, mars, merc and venus as well as jupiter, saturn and those. Basically a solar system without the solar part. Was just wondering what an "earth" would be like if it evolved without a stelar companion, not even a brown dwarf. Not to mention the possibility of planets that did evolve with a star but when the star "turned on" so to say and started shining, what if that initial explosion caused the planets forming with it to be ejected from that system, causing yet more "rogue planets"
Naively I would expect the copious numbers of moons around our own gas giants would seem to argue otherwise. However, I will grant that perhaps the formation of those planets was aided and abetted by the Sun.Chronos said:Gas clouds small enough to form brown dwarfs appear to lack the mechanics necessary to form planets of any appreciable size - so far as I know. You need repulsive forces, like fusion ignition and solar winds, to shock remnant materials into forming planets.
Algr said:When a star forms, how much of the proto planet mass gets ejected, instead of forming into planets circling the star? Could there be more Earth sized planets in deep space then orbiting stars?
Algr said:This leads to another question: What are the chances of an Earth sized or larger object entering the inner solar system? Is "When worlds collide" plausible within the life of the solar system?
Algr said:For all we know, some of the jovian moons could have formed on the other side of the galaxy. (Triton, anyone?)
Chronos said:I doubt anyone can even make a reasonable guess at the proportion of ejecta during stellar formation - too many variables. I would guess this is a large proportion, given Oort cloud observations.
Chronos said:I also believe planetary formation is a reasonable consequence of mass exiting the solar system during this phase of stellar formation.
Wallace said:No, the distances are too great and the velocites of any ejected planets far too small for a moon to cross the galaxy, even given the entire age of the Universe (let alone the age of the galaxy). I think it would be hard enough to get from star to star within the age of the Universe, let alone across the galaxy.
It is also highly unlikely that a body entering the solar system anew would be captured into a stable orbit around say Jupiter. If you look at what happens to comets etc on plunging entries into the solar system from the Oort cloud, they don't end up orbiting the planets.
Chronos said:The sun may have originated as a member of a binary system that was gravitationally ravaged billions of years ago. The possibilities are unbounded.
The theory suggests that small pockets of gas and dust in the universe can come together through gravitational forces to form planets without the presence of a central star. This is known as "rogue" or "free-floating" planets.
It is believed that these planets can generate their own heat through the decay of radioactive elements within their core. They may also have their own atmosphere and reflect light from nearby stars or galaxies.
The chances are very slim, as these rogue planets do not have a stable source of energy and may not have the necessary conditions for life to thrive. However, it is not impossible for microbial life to exist on these planets.
Yes, there have been a few cases of free-floating planets that have been discovered through gravitational microlensing, where their presence is detected by the bending of light from a background star. However, these planets are difficult to detect and may be more common than we realize.
If confirmed, it would challenge our current understanding of how planets form and evolve in the universe. It would also open up new possibilities for the existence of habitable worlds outside of traditional planetary systems.