One morning recently, when I went out for a walk, it was chilly. The sun was just out in his golden splendour, the sky was clear, but there was frost on the new spring grass, and the air was a crisp 3 degrees Celsius, about 38 Fahrenheit. As I returned, the frost looked like dew, and it was a tad bit warmer. Later in the day, it is forecast to be a relatively warm (for Toronto) sixteen degrees Celsius, or 61 Fahrenheit.
The sun did not overheat the atmosphere, a little extra spurt of energy and all that grass can easily go up in flames, and a pleasant morning walk can turn into an infernal blaze of a jaunt!
The sun, our sun, looks like a small disc, but is really massive, much much bigger than our earth.

The sun sustains life on our planet. Without the sun no life can exist on our planet. Most energy on our planet comes from the sun, directly and indirectly.
The heat of the sun, the scientists say, is a result of a massive fusion reaction.
Fusion is when one atom fuses, or joins into another, like for example two hydrogen atoms fuse together to become one atom of helium. Wikipedia says that the sun fuses 620 million metric tons of hydrogen and makes 616 million metric tons of helium each second. And in the process, the sun releases a certain gigantic amount of energy all around it. The earth gets a tiny fraction of that energy as heat, light, and so on.

If the rate of fusion increased, we would be burned to a crisp from the heat. If the rate of fusion decreased, we would go into a wintery spiral, freezing all of us to death very quickly.
But clearly, the sun does not get hotter or warmer than it is. There is strict regulation. In fact, even though scientists know how to fuse hydrogen into helium, they have not been able to do it in a controlled fashion yet. In other words, every attempt so far results in what is called a hydrogen bomb, a massive destructive explosion.

Some companies are trying to perfect controlled fusion and they may very well be able to do this one day. Some say it will solve the energy woes of the world even, but all attempts at fusion are tightly engineered, there is a tremendous amount of complex machinery being used to try and successfully control nuclear fusion reactions.

There are scientists, engineers, operators, and mathematicians, and many more very highly educated souls at work in trying to perfect fusion. There are billions of dollars of venture capital investments too.
Is it then reasonable to expect the the sun remains at a precise temperature without anyone looking after it? Does it make sense to understand that this large power source is without some sort of controller?

The Vedic texts tell us that the sun has a chief engineer. His name is Vivaswan. He has a whole team of scientists and technicians assisting him.

Well of course, there is another modern misconception that goes like “well the sun is so hot there is no chance of life on the sun”. Is that a reasonable assumption? I cannot live under water, I cannot live in the sky, I cannot live inside the mud or deep inside the earth. Doesn’t mean there aren’t bodies suitable for those environments.
Similarly, if an environment is made up of fire, then there are bodies made of fire, just like within the depths of the ocean, there are watery bodies.

The Universal Cosmic arrangement is carefully designed, the planets don’t stay in orbit by accident as much as an airplane remains on its flight path or satellite remains in its orbit by accident. Financial markets don’t remain accidentally in equilibrium without astute traders and managers carefully controlling them. There are all sorts of small and big controllers keeping track of all this. This is true within man-made systems, though we often lose control of systems we created. The Universal arrangement is no accident too.

There is a higher power, and a Supreme Controller of all controllers…
भोक्तारं यज्ञतपसां सर्वलोकमहेश्वरम् ।
सुहृदं सर्वभूतानां ज्ञात्वा मां शान्तिमृच्छति ॥ २९ ॥bhoktāraṁ yajña-tapasāṁ
sarva-loka-maheśvaram
suhṛdaṁ sarva-bhūtānāṁ
jñātvā māṁ śāntim ṛcchatiA person in full consciousness of Me, knowing Me to be the ultimate beneficiary of all sacrifices and austerities, the Supreme Lord of all planets and demigods, and the benefactor and well-wisher of all living entities, attains peace from the pangs of material miseries.
https://vedabase.io/en/library/bg/5/29/