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How big is VY Canis Majoris?

VY Canis Majoris is 2 terameter

Introduction to VY Canis Majoris

Have you ever wondered what the biggest things in the universe are? Well, let’s talk about one of them - VY Canis Majoris. This star, tucked away in the constellation of Canis Major, is one of the largest and most luminous stars we know of in the Milky Way. It’s not just any star, but a red supergiant, a type of star that’s not only huge but also incredibly bright.

Size Comparison

Now, let’s try to imagine just how big this star is. To give you an idea, let’s compare it to some things you might be familiar with:

  • VY Canis Majoris is about 17 times the mass of our Sun. Imagine if you could line up 17 Suns side by side - that’s how massive this star is! - If we could place VY Canis Majoris in our solar system, it would extend beyond the orbit of Jupiter. Imagine, a star so large its surface would reach out past the fifth planet from the Sun! - The distance from the Earth to the Sun is about 93 million miles, a length astronomers call an “astronomical unit” or AU. VY Canis Majoris is so big that it’s about 1,800 AUs in diameter. That’s like going to the Sun and back 900 times!

Interesting Features of VY Canis Majoris

VY Canis Majoris isn’t just interesting because of its size. It has some other cool features too:

  • It’s an oxygen-rich red supergiant. That means it has a lot of oxygen in its atmosphere, much more than many other stars. - Despite being so far away - about 3,900 light-years from Earth - it’s one of the brightest objects in our part of the galaxy. That’s due to the infrared light it gives off, which is really strong at wavelengths of 5 to 20 microns. - Not only is VY Canis Majoris big and bright, but it’s also losing mass. It has a complex envelope around it, which is caused by the star losing material over time.

VY Canis Majoris in the Universe

VY Canis Majoris is part of the large molecular cloud Sh2-310, a star-forming region with a diameter of 681 light-years. This region is a bit like a cosmic nursery, where new stars are born. In short, VY Canis Majoris is a fascinating example of just how incredibly vast and diverse our universe is. Whether it’s the size comparison to our own Sun, the strong infrared light it emits, or its place in the universe, VY Canis Majoris truly is a celestial wonder.

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