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I don't quite understand why you're being so pedantic about this. The earliest reference I could find was from 1987, theorizing that proto-planetary objects cou

I don't quite understand why you're being so pedantic about this. The earliest reference I could find was from 1987, theorizing that proto-planetary objects could be ejected from a planetary disk and that this likely happened in our solar system due to sling-shotting from Jupiter[1]: > After Jupiter had accreted large amounts of nebular gas, it could have gravitationally scattered the planetesimals remaining nearby into orbits which led to escape from the Solar System. But this was purely speculative. It wasn't until many years later that the planet was actually observed. > After billions of years, I would expect all planets be attached (gravitationally) to a star, shouldn't they? I am not sure what you mean by that. All planets are formed in disks surrounding a star (or possibly a brown dwarf); rogue planets are planets that were able to escape the influence of that star. It might take billions of years before they get close enough to another star in the galaxy to fall into its influence. [1] https://ntrs.nasa.gov/citations/19870013947 https://ntrs.nasa.gov/citations/19870013947

part1of2 6y ago
The comment came off stronger than intended. It sounded like lazy journalism that made a claim, but then used a different conclusion. Thank you fr pointing me to the NASA site. > that were able to escape the influence of that star. What's the mechanism here? Is it something with greater mass that pulled it into an escape?
- Aerroon 6y ago
  >>that were able to escape the influence of that star. >What's the mechanism here? Is it something with greater mass that pulled it into an escape? I'm a layman. Take what I say with skepticism, but I think in this case the parent poster was referring to any mechanism that ends up with a planet getting out of the orbit of the star. One such potential mechanism is gravitational slingshotting. Let's imagine you have a planet orbiting a star. A satellite flies in towards the planet. As the spacecraft passes by the planet, it gets some of the momentum of the planet as the planet is moving around the star. The planet loses that momentum. This increases the satellite's velocity in relation to the sun. The satellite can reach escape velocity and escape the influence of the star. Edit: alternatively to reading my explanation, you could read Wikipedia's: https://en.wikipedia.org/wiki/Gravity_assist#Explanation https://en.wikipedia.org/wiki/Gravity_assist#Explanation There's an amazing gif of Voyager 2's slingshots. Pay attention to the velocity as it passes planets: https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Animation_of_Voyager_2_trajectory.gif https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Ani... I don't see why a similar thing couldn't happen to planets.
- klyrs 6y ago
  https://www.google.com/search?q=orbital%20simulator https://www.google.com/search?q=orbital%20simulator Play with a few orbital simulators. Many are quite simple, but others allow a great deal of flexibility. It's actually quite a tricky business to get more than a few massive bodies into stable orbits -- gravity alone leads to extremely chaotic systems.

part1of2 6y ago

The comment came off stronger than intended. It sounded like lazy journalism that made a claim, but then used a different conclusion. Thank you fr pointing me to the NASA site. > that were able to escape the influence of that star. What's the mechanism here? Is it something with greater mass that pulled it into an escape?

Aerroon 6y ago
>>that were able to escape the influence of that star. >What's the mechanism here? Is it something with greater mass that pulled it into an escape? I'm a layman. Take what I say with skepticism, but I think in this case the parent poster was referring to any mechanism that ends up with a planet getting out of the orbit of the star. One such potential mechanism is gravitational slingshotting. Let's imagine you have a planet orbiting a star. A satellite flies in towards the planet. As the spacecraft passes by the planet, it gets some of the momentum of the planet as the planet is moving around the star. The planet loses that momentum. This increases the satellite's velocity in relation to the sun. The satellite can reach escape velocity and escape the influence of the star. Edit: alternatively to reading my explanation, you could read Wikipedia's: https://en.wikipedia.org/wiki/Gravity_assist#Explanation https://en.wikipedia.org/wiki/Gravity_assist#Explanation There's an amazing gif of Voyager 2's slingshots. Pay attention to the velocity as it passes planets: https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Animation_of_Voyager_2_trajectory.gif https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Ani... I don't see why a similar thing couldn't happen to planets.
klyrs 6y ago
https://www.google.com/search?q=orbital%20simulator https://www.google.com/search?q=orbital%20simulator Play with a few orbital simulators. Many are quite simple, but others allow a great deal of flexibility. It's actually quite a tricky business to get more than a few massive bodies into stable orbits -- gravity alone leads to extremely chaotic systems.