Why Sun Is not a Planet Just Bigger In Size not a Fireball | Planet vs Star | Fundamentals!

Fundamental Difference Between Planet & Sun

Ever wondered why Sun(star) is a huge fireball and not a huge planet?

Actually, it's the mass per unit volume (density) of a planet that decides if a planet stays a planet or turns into a star. There exists a huge number of different kinds of stars but today we won't be talking about it. In fact, we will be more focusing on why stars are so different from the planets? You will be thrilled to know how similar the two are. If the density of the planet Earth were to increase by some mechanism then at one point or another Earth would end up turning into a star.

• Over one million Earth’s could fit inside the Sun.

So why Earth is not a star with nuclear fusion taking place at its core. Its because the mass of Earth is way too small as compared to the mass of even the smallest star among all, our Sun.

• The Sun accounts for 99.86% of the mass in the solar system.

We'll be talking about Sun but it's the same for all stars.

It's the extreme gravitational forces acting on the elements that cause Nuclear Fusion on Sun. At the surface, its H+H = He and then He+He = Be and so on until the fusion results in the formation of Fe at the core of the Sun and Fe is a special element because no further fusion occurs afterward as Fe has the best suited binding energy and there is no more stable element in that sense and thus Fe+Fe never occurs. But the crushing of all Fe atoms created every second, at the center (core) of Sun, leads to radiations and radiation leads to loss of atoms and thus the mass of Sun and thus decline in the gravitational force and thus relatively relaxation at the crushing of Fe atoms at the core. 

Since the lighter elements combine to form heavier elements, the volume of Sun increases and thus again the gravitational force decreases in the process.

• One day the Sun will consume the Earth.

Cool, now you know what fundamentally differentiates a star from a planet. 

Some Amazing Sun Facts:

• The Sun is almost a perfect sphere.

• The Sun is traveling at 220 km per second.

• The Sun will eventually be about the size of Earth.

• It takes eight minutes for light reach Earth from the Sun.

• The Sun is halfway through its life.

• The distance between Earth and Sun changes.

• The Sun rotates in the opposite direction to Earth.

• Temperatures inside the Sun can reach 15 million degrees Celsius.

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Fun and fruitful..!!

-Aditosh