a planet like star can die, and a few year later it would form a new star again, even without any source of energy
[CITATION NEEDED]You are contradicting yourself dear, stars have been studied, as aircrafts has been studied.
Therefore if you are looking for explanation on how aircrafts fly, there are many books about aerodynamics and aircraft design that you can find. This is the same with stars. There are many studies publicly available if you want to learn about it, and it is theorized with relation to speed of light.
As I've said before and I will said it again, A PLANET OR STARS CAN DIE BUT IT WON'T FORM INTO A NEW STAR
I would hate to contradict you. Although many stuff are studied, just as star is studied, aircraft is studied. That study doesn’t mean much, because a study is always updated with new information as the time goes, the information come from human interaction with the studies, what they saw with their eyes and translate it into study and written into book to be reference in the next study, in the end it’s all about what we saw is the most solid form of proof you would ever needed.
If you insist on having citation, why not think and with your eye wide open,
this world can’t be existed for a few millions years since everything is finited, but the planet we are living right now have been more than a few billions years of life yet it’s not exhausted of its finited life. There could be a revive of star in the meantime to justify this very missing puzzle pieces, just as the life form, a new life is form to inherit the life that’s gone, the entire universe is working in this same format of forming new life and retiring old life, even the chemical itself is working in this very format, it’s not absurd to connect the dots and come to a decision star is able to form a new one after the old one is retired due to its running out of finited energy.
The logic is remarkable xD
Let's talk about energy first. Energy is something you can't create nor DESTROY. Energy comes in different forms, there is this renewable energies available in our surroundings. But talking about space, energy on earth can be describe as the energy in one form, as this is just a small piece of floating object in the system.
Finite energy you said has been contained in the atmosphere of the earth, thus limiting the dispersion of kinds of energy in the solar system. THEREFORE, having amount of time before completely gone that will take billions of years.
Eyes can see and analyze, but researches can be done to prove what we are imagining and thinking the moment we see something.
There are many photos from different telescope in the world that you can see a star that exploded, but no other stars formed.