Planets don't live forever

Planets don't live forever

The lifetime of planets is limited. When their star will explode in the nova or supernova eruption, some of them will just vaporize. But the lifetime of the planet depends on another thing. The magnetic field, what is keeping the cosmic radiation away from the atmosphere or the core of the planet is not forever. The radioactive material that keeps the nucleus of the planet liquid is ending someday.

That thing means the liquid stone that keeps the nucleus of the planet rotating will turn solid. And when the nucleus of the planet will solidify, the magnetic field and atmosphere are lost. That means that the cosmic radiation will hit the surface of the planet and start to cut the molecules of the planet into pieces. So sooner or later the planet will vaporize anyway even the asteroids or meteorites will not destroy it.

The Earth-size rogue planets might be similar to Earth in the past. But then the eruption of their sun has thrown them away from their solar system.

The Earth-size rocky planet, what travels around the galaxy as the rogue planet tells that the massive eruptions are always happening in other solar systems. The Earth-size rocky planets are interesting because their atmosphere might blow away in those cosmic convulsions. In the past, those rogue planets could be like Earth. But then the eruption of the star has blown them away from their orbiter.

The reason why there are no giant gas planets inside the asteroid belts is that the solar wind will blow the gas away from their core. If Earth would orbit at the trajectory of Uranus, this planet would have an extremely bold atmosphere, and it will look like some gas giant. The fact is that if the atmosphere of the planet is bold, that thing will decrease the radiation level that reaches the surface of the planet. And then the decreasing radiation decreases the possibility of photosynthesis.

The gravity field of those planets is very important because the gravity resists the solar wind, and the large planet would have a bolder atmosphere than smaller planets. If the atmosphere is too thin that is not a very good thing Thin atmosphere that allows infrared radiation but also the meteorites hit the surface of the planet. A planet what gravity is weak can also create a bold atmosphere, but the distance of the planet from the sun would be higher. And bold atmosphere closes the radiation away from the surface

https://www.syfy.com/syfywire/how-our-galaxy-will-kill-our-solar-system-in-a-trillion-years-planet-by-planet

https://www.space.com/smallest-rogue-planet-discovery

https://en.wikipedia.org/wiki/Rogue_planet

Image: https://www.space.com/smallest-rogue-planet-discovery

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