The size of the sun in comparison

It is the fire of life. It can be kind but it can get angry. But it never throws its weight around. It is the sun. And although it is 330,000 more massive than earth and contains 99.8% of the mass in our solar system, it is small in comparison with some other stars.

The sun never ceases to amaze us with its theatrics, its lava flares dancing across its surface in a ballet of nuclear fusion, sometimes leaping millions of miles into the air. And although the sun is big, its intense heat and light makes it difficult to capture good images with normal instruments. So NASA scientists use an Helioseismic and Magnetic Imager and an Atmospheric Imaging Assembly detector to view the ultra-violet (UV) and extreme ultra-violet lithography (EUV) wavelengths released by the sun. The resulting images are spectacular.

Full disk image of the sun. Ain’t it beautiful?!


Full disk image of the sun as taken by NASA Solar Dynamics Observatory, which orbits 22,300 miles above earth.

Earth in comparison to the sun

Earth’s distance from the sun varies between 91.4 million miles – in January – and 94.4 million miles – in July. The average distance of 92,955,887.6 miles (149, 597, 870.7 kilometers) is called 1 astronomical unit (AU), a measurement that is used to report distances to other planets and stars as well. In short, it’s not a weekend drive.

NASA puts the size of earth to the sun in perspective like this: Suppose the radius of Earth were the width of an ordinary paper clip, the radius of the sun would be roughly the height of a desk, and the sun would be about 100 paces from earth.

Earth size in comparison to the sun and other planets

planetsizes(Hey, we’re small but we’re beautiful!)

The size of the sun in comparison

Our sun is one of billions in the entire universe. It also is fairly small in comparison with other big stars. In fact, our sun is classified as a G2 dwarf star. Sirius, the brightest star in the night sky, is twice as massive as the sun and 25 times more luminous. And Sirius is dwarfed by Pollux, which is eight times the radius of the sun. And Pollux is dwarfed by Arcturus, which is almost 26 times the size of the sun.


It’s a big, big universe

But there are bigger stars yet. When compared to Antares, our handsome sun is a mere pixel on a map. And Antares is not even the biggest star. That title is thought to belong to a star called VY Canus Majoris. It is about 2,000 times the size of the sun, or more than twice the size of Antares.

Sun in comparison to Antares


Note that it VY Canus Majoris is the biggest in size but not mass. The currently known most massive star is thought to be WR 102ka – known as Peony Nebula Star – at about 175 times the mass of the sun.

How big is the universe?

The Wilkinson Microwave Anisotropy Probe calculated the age of the known universe at 13.7 billion years old, based on its radius of 13.7 billion light years. And it is growing bigger every day, at a speed of 71 km/s/Mpc. The size of the whole universe is estimated to be 78 billion light years. If you start traveling today at 60 miles per hour (100km/h) you’ll get to the end of your first coffee stop, the end of one light year, in nine trillion years. Then you just keep going for another 77.999 999 billion light years. Or you could stay here, look after our beautiful planet… and enjoy the sun.

04/23/2010. Category: science. Tags: , , , .

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  • Jim Romeo

    The only way to open the door is to die. You ready for that? Have at it.

  • Jim Romeo

    I did some math a few years ago to determine the volume of the universe in cubic inches, assuming it is 13.7 billions years old. My answer came out to be about 1×10 86 power. Not really that big. The chances of one man fulfilling all the prophesies of the old testament concerning the Messiah is 1×10 135 power. That is HUGE!

  • Jim Romeo

    I somehow recall the US getting our Constitution from the Bible by religious men, like Sam Adams and John Hancock and the rest after much prayer.

    • Rohn Johnson

      Well, you recall wrongly, Jim Romeo. The framers of our Constitution were secularists. Jefferson, Madison, and they built in protections against loonies like you who would prefer a government run by the church, not unlike Sharia law. If guys like you were not limited in your reach, then we’d still be hanging witches and our scientific discovery process would have been shackled.

  • Rohn Johnson

    You’re a moron, Ken. Science is how we come to know things. It is a self-correcting process that allows us to spiral in on absolute truth as succeeding studies allow ever-finer resolution on the subject matter. You, on the other hand, have cemented your brain into place based on politically motivated stories concocted during the early iron age. Good luck with that. Keep your superstitions off pages relating to science, like this one. You stink up the place. Idiot.

  • Rohn Johnson

    Skeptical scott … in the interest of honesty and accuracy, you should change your handle to Superstitious scott. Science, you moron, is how we find out how the world works. It is how we come to know things in a trustworthy way. “Scientific theory” has specific meaning that is quite different than the way you understand the definition of an ordinary “theory.” Google it, you naive child. Then try to build your understanding of the scientific process from there. Then throw away that book of fairy tales you call the Bible. Become an adult.

  • Rohn Johnson

    Go away. Go cut off hands in the Middle East somewhere. Idiot.