Gaia telescope discovered 21 neutron stars nearby sun-type stars.

"Astronomers have identified 21 distant neutron stars in binary orbits with Sun-like stars, revealed solely by their gravitational effects. These findings, facilitated by the Gaia mission, suggest complexities in binary star formation theories, given their unexpected survival from supernova events. Credit: SciTechDaily.com" (ScitechDaily, Gaia Reveals 21 Hidden Neutron Stars in Mysterious Cosmic Dance)

The discovery tells us that stars of different ages can form binary star systems. That means the other companion of the binary stars can be far older or different from the other. 

The thing is that neutron stars are the result of heavy star explosions as supernovas. That means neutron stars are not always older than their companion stars. The heavy star can live a shorter time before it detonates as a supernova. However, the supernova explosion should affect another member of the binary star system.  

The impact wave should blow lots of the companion star with it. Or even destroy the companion star. In the first case, the supernova explosion can change the companion star's spectral type by blowing lots of its mass into space. 

The Gaia telescope found neutron stars near sun-type stars. And that almost proves that some stars can have older planets than they are.  But the thing is that the neutron star can be the remnant of the same age, but heavier star. The neutron star that travels in the universe can also meet some other star, and pull lots of material from it. That means the neutron star can also turn blue stars lighter. 

The first case when astronomers saw this kind of situation where two different types of objects orbited each other was when a star remnant and a young star formed a binary star pair that was Cygnus X-1 and Sirius. 

In Cygnus X-1 the invisible companion that sends powerful X-ray radiation orbits the blue giant star. The spectral type of the visible companion of this binary star is O, which means that the star doesn't exist for a long time. 

Sooner or later that star whose mass is about 21 sun masses will detonate as a supernova. And then that blue star turns into a black hole. In that case, the Cygnus X-1 turns into a double black hole. The thing is that the Cygnus X1's invisible companion pulls lots of material out from the blue supergiant. It's possible. The bright companion will turn far smaller before it loses its fuel and detonates as a supernova. 

The companion believed it was a black hole. In the case of Sirius, the white dwarf Sirius B orbits the blue star Sirius A. Sirius is one of the most well-known stars in the northern sky. The spectral type of Sirius A is A and its mass is about 2  times the Sun. Sirius B is a white dwarf about 1,02 times heavier than the Sun. 

What makes this star interesting is that it's been a sun-type star. And the size of that thing star is about the same as Earth. 

https://scitechdaily.com/gaia-reveals-21-hidden-neutron-stars-in-mysterious-cosmic-dance/

https://en.wikipedia.org/wiki/A-type_main-sequence_star

https://en.wikipedia.org/wiki/Cygnus_X-1

https://en.wikipedia.org/wiki/O-type_star

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

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

https://technologyandfuture4.wordpress.com/2024/07/20/gaia-telescope-discovered-21-neutron-stars-nearby-sun-type-stars/