How Old is the Sun?

To better understand how old the Sun is, it is important that we learn what a star’s life cycle is like. The Sun is a star and stars have life cycles that depend on their masses. The Sun starts off as a super giant cloud that is made of cold molecular hydrogen. A passing star, a shock wave or a passing supernova can trigger this giant cloud to collapse. When this happens, the gas and dust that composes this giant cloud get collected together to form a single mass that would then turn into the Sun.

It would then spend most of its life quietly and slowly eating up the hydrogen in its core. This would take billions of years. By the time it’s 7 billion years old, it will slowly become cooler and bigger and when it reaches 10 billion, it would have changed into one huge red giant whose atmosphere could stretch all the way up to where the earth is.

So how old is the Sun? It is about 4,600,000,000 years old. Yes, that’s more than four and a half billion years. It is expected to live on for another several billion years so we shouldn’t be expecting any surprises in our lifetimes. It has another four or five more billion years before it fully uses the fuel its core.

Now, you might be asking, how exactly did the astronomers determine the age of the Sun? And how did they do it with such accuracy? It is quite simple actually. They look into the meteorites that have fallen all around this planet of ours. They collect these fallen rocks and study and analyze them back in their labs and voila, the age of the Sun is known. They make use of a technique they call radiometric dating. It is of course a thousand times more complicated than how we describe it here but you get the idea.

  • what you don’t know can hurt you

    are any of you aware that if science haphazardly sends a probe containing iron to study the sun..when it finally gets pulled in by gravity…the sun will in all effect be no more in less than 3 seconds….
    If you don’t believe me then ask another astrophysicist. That is how ignorant scientist are to all the factors in our functioning universe.
    There are also too many unknown factors so as to start declaring every “majority belief theories” as fact. How many times has the physics world changed a long-held notion on it’s head ? Too many times to count…and well enough to not hold tightly to any “theory for fact ” methodology.

  • diamond eugene

    well i think that all of u guys are wrong yall dont kno how old the sun is nobody nos but god so stop making up lies and yall need to stop beliving them. plus the sun cant explode duh think before u speak !!!!!!!!!!!!

  • neylia sharft

    Hi there! I dont know how old is the sun but 1 thing that i know is that scientits are dull+ foolish and there are also many answers about the aghe of the sun. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!bye………..bye

  • http://WWW.FACEBOOK.COM Scheichi

    but how sure r u??? is IT POSSIBLE THAT IT CAN EXPLODE?????????!!!!!!!!!!!!!!

  • CAKE.

    you’re all dumb. :) and kiera graham of course the sun is hot. like what? huh? i can’t even. how can you be so stupid.

  • http://qwerty melani

    that is for u unknown

  • http://qwerty melani

    its true the sun IS 4 600 000 000

  • billy bob

    this really helps .thnx

  • bowen potter

    WOW thouse are really interesting facts!!!! its cool!!!!!!!!!:p

  • Liliana

    Well Unknown do u know how old is the sun?

  • bob

    i dont like u

  • unknown

    …and voila, the age of the Sun is known…a thousand times more complicated but you get the idea. Really?? Get a new writer, Einstein, preferably one with some knowledge of astronomy. Judging by the other comments from fourth-graders, I guess it doesn’t matter much to you, which just makes me sad for the future of our civilization. 5 billion years can’t pass quickly enough…

  • http://google unknown

    thats a lie that the sun is 4,600,000,000 first of all no one was alive that long so its just a theary.

  • http://planetfacts melodie jones

    WOW!alls i had to look up was how old the sun is and that is old!i wish i could live as long as the sun and still look as young as i do now!

  • http://welcometotheplanets kiera graham

    hi there i was wondering if i could see how old the sun is and if i could see if the sun is hot