Rendezvouses between stars in the universe
Rendezvouses between stars happen quite often if we are thinking about the scale of the universe. And most of them are remaining out of our knowledge. Sometimes those rendezvouses cause very dramatic changes in the solar systems. Some astronomers have been introduced the idea that rendezvouses between other stars have been caused five extinctions on Earth.
But the problem is that the suitable star has not found yet, and that thing makes that kind of extinctions, what happened after the Ordovician period. And the last of them destroyed the Dinosaurs. The thing is that sometimes the reason for those cases has been introduced hypothetical "Nemesis-star"(1).
The hypothetical star what orbits the Sun very distant and elliptic trajectory, but the problem is that nobody has ever found that star. There has been introduced an idea that Proxima Centauri would be "Nemesis", but the other explanations would be that there is some kind of black hole near the sun, which would sometimes cause an extremely powerful effect on the solar system.
Many times of the day the Earth would face the antimatter particle, which destroys a couple of molecules from the atmosphere, and the antimatter is one of the reasons why the planet cannot maintain lifeforms forever. Sooner or later during billions and billions of years, the molecules of the atmosphere would be ended or the solar wind would blow the atmosphere of the very old planet away when the radioactive material inside it would be ended.
The existence of the radioactive material would not mean that the internal parts of the planet cannot be melted. The tidal wave forces would melt the nucleus of the planet long after the final radioactive particle from its structure has been gone. But the tidal forces cannot remove the effect of antimatter, and when if we are thinking that the age of the eldest confirmed exoplanets is about the 12-14 billion years, that means that there are not very many gasses on the planet.
There is little possibility that the planet could change its central star. In that case, the heavier star or the star, what gravity field is more dominating than the original central star would just rob the planet from the original solar system.
And even if only the couple of molecules would be destroyed every day, but when this process would continue billions and billions of years, there would be not atmosphere remaining. One of the eldest known exoplanet Methuselah (PSR B1620ā26 b) is orbiting the white dwarf is orbiting the neutron star, and the surface temperature would be so low, that the atmosphere will be the ice on the surface. The age of that planet is about 13,7 billion years. There is a possibility that "Methuselah" is a so-called post solar planet, which is forming after the star has been exploded as a supernova.
(1) https://en.wikipedia.org/wiki/Extinction_event
(2) https://en.wikipedia.org/wiki/Nemesis_(hypothetical_star)
(3) https://en.wikipedia.org/wiki/PSR_B1620%E2%88%9226_b
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