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Is the Sun a Star?


Twinkle, twinkle, little star. Many people like to stargaze when going on a romantic first date, but not many decide to watch the Moon or the Sun instead, even though the Sun is a star – because let us face it: “Do you want to watch the stars?” sounds better and will more likely get you that date. Next time, if you wish to spice up your date with your beginner astronomy knowledge about the universe you read in a magazine, just remember that every Sun is a star, but not every star is a Sun.

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Stars in Space

We can see a lot of space mysteries from the Earth, especially through a telescope, regardless of where in the world you are. Some celestial objects, like a particular planet, are very far away, so we see them as points of light and assume they are stars, but this is not always the case. Stars are objects in the night sky that are considered majestic, but they are not only pleasant to look at, they are also the most vital building blocks of galaxies.

Looking at it from a less poetic perspective, stars are enormous balls of burning gas that give off light. Unlike the film A Star is Born, these stars are born within the clouds of dust and spread all over the universe. When a different star explodes, the shock wave produces the gas cloud to contract. It heats up and forms something we call a protostar.

Within the compacted cloud of hydrogen and helium, a nuclear reaction begins within which large amounts of light is released, and the star begins to shine. A vast majority of the stars in our galaxy, including the Sun, fall into the category of something we call main-sequence stars, making the Sun a star. Stars of an intermediate mass have lifetimes that range between 50 million and 20 billion years

Source: Wired

The Sun in Our Solar System

To us, all stars are pleasing to the eye, but one star in our galaxy stands out, not because of its looks, but because it gives us life. That is the Sun. A fun astronomy fact: for the Earth and in some cases, a neighbouring planet or two, the Sun is the centre of attention. Not because of its go, but because it holds the solar system together.

The Sun supplies us with light, heat, energy, and creates weather, which is essential for the environment we live in. So as much as you may not like the headache it gives you when spending too much time tanning, you surely do need it in your life – much like your spouse.

“Yellow dwarf” in our Solar System

For a short history lesson, the Sun came into existence more than 4.5 billion years ago, when a cloud of dust and gas called a nebula collapsed. The Sun in our solar system is called a yellow dwarf“, but the colour yellow in the name could be misleading, considering it is white.

From where we are standing, the term dwarf might also not be the best name to give it, as our Sun is 109 x wider than Earth, but since it is many km away, The Sun is, however, extremely hot, with its core temperature at 15.5 million Celsius. And no, that is not a spelling mistake.

The Sun as a Star

Our Sun, known as the G2V star, is a middle-aged star, as it is around 5 billion years old. It is the largest Sun in our solar system, but this title is not difficult to achieve, as it is the only one, as far as we know, and the same applies to the Moon.

NASA (National Aeronautics and Space Administration) claims that there is an infinite number of stars, so naturally, some will be bigger, and some smaller than ours. While our Sun is an average-sized star, it is still ridiculously large. Our star’s brightness does not vary by much and that may be one factor key to the evolution of life on Earth.

Sun (Yellow dwarf in our solar system)
Source: Quantamagazine

The Difference Between a Sun and a Star

There is no difference, but a huge one at the same time. Namely, every Sun is a star, but not every star is a Sun. The Sun is larger and as such a lot brighter than most stars. There are billions of Suns in our galaxy alone and as mentioned, many of the stars we see are also Suns. But many celestial objects you see when looking up are not stars.

A star is called a Sun only if positioned at the centre of a planetary system. And because many stars in the galaxy also have planets orbiting them, this also makes them Suns. The Sun appears about 64 billion times brighter than it would if it were at the distance of the closest star. Our brains cannot imagine how much brighter the Sun appears to be than the nearest star, which is why they seem so different.


According to science and astronomy, the Sun is a completely ordinary star: a big, glowing ball of gas. In its core, it combines hydrogen into helium, as every star does, to generate a sufficient amount of pressure so it dodges the bullet of collapsing under its own gravity. It shines brightly and keeps us warm. But if you clicked on this article to find a one-word answer for your research whether the Sun is a star or not, we apologise for making you wait until the end to tell you that the answer is yes.



      • Yes. That said, remember, we live in a solar system (ie, ‘Sol’, our sun’s system). It’s not a galaxy. Our solar system is just one of millions (actually, billions) in our Milky Way galaxy. So it goes like this: planets (like our Earth), orbit stars (like our sun), and together they form a solar system, and they reside inside galaxies (like our Milky Way), which is part of our “Local Group” of galaxies which include the Triangulum (smaller than the Milky Way) and Andromeda (larger than the Milky Way) galaxies. The current estimate for how many galaxies exist in the universe is 2 trillion (with a T). This number keeps expanding, however, as our technology gets better.

  • “In conclusion, to answer the question ‘is the Sun a star or not?’ the answer is yes?”


    “Is it a star?” “Yes.” “Is it not a star?” “Yes.”

  • Good grief! I actually understood the article! What a brilliant author to be able to make this clear to those with no astrological background or knowledge. Fascinating! Thank you!!

  • So if every sun is a star but not very star is a sun….I presume the stars that are not suns are plants?
    Or ?……

  • “but not every star is a Sun”.

    R U saying that a sun without a planets in orbit, they are NOT sun, but a star.
    Name a few suns without planets please

    • There is no sun without planets orbiting around it. That would make it a star instead. As the saying goes “every sun is a star but not every star is a sun. For it to qualify to be called a sun 1) it has to be at the center of the planetary system and 2) it has to have planets orbiting around it.

  • i think due to the fact that both our G2V and other stars made up of helium and hydrogen….then they are of the same family right!?

  • Some photos of other sun’s ie with planets orbiting in our Milky way would be awesome and if not names of some of those sun’s would be helpful for research please and thanks

  • I’m not clear about the second part of the question. Ie, every Star is not a Sun. Kindly, tell me what are those ‘others’ classified as Stars but are not Suns?

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