Vy Canis Majoris vs Sirius vs Ton 618

Vy Canis Majoris vs Sirius vs Ton 618

Vy Canis Majoris vs Sirius vs Ton 618: Exploring Three Cosmic Giants

When it comes to exploring the cosmos, the universe never ceases to amaze us with its vastness and diversity. Among the countless stars and celestial bodies, some stand out for their extraordinary characteristics. In this comparison, we'll delve into the fascinating worlds of Vy Canis Majoris, Sirius, and Ton 618, each offering a unique glimpse into the wonders of space.

Ton 618 vs Vy Canis Majoris vs Sirius

Here's a concise comparison of Vy Canis Majoris, Sirius, and Ton 618:

Vy Canis Majoris:

  • Red supergiant star
  • Enormous size, 1,800 times Sun's radius
  • Relatively cool surface temperature, emitting reddish light
  • Located around 3,900 light-years away

Vy Canis Majoris, often referred to as VY CMa, is a star that belongs to the category of red supergiants. It's located in the constellation Canis Major, and its sheer size is mind-boggling. In fact, it's one of the largest known stars in the universe. Its radius is estimated to be around 1,800 times that of the Sun, which means that if Vy Canis Majoris were placed at the center of our solar system, it would engulf the orbits of Jupiter and Saturn. Due to its immense size, it has a relatively low surface temperature, emitting a reddish glow.


  • Main sequence star (A1V)
  • Bright and bluish-white in color
  • Smaller than Vy Canis Majoris, 1.7 times Sun's radius
  • Closest star to Earth after the Sun, about 8.6 light-years away

Sirius is one of the most well-known stars in the night sky, often referred to as the "Dog Star." It's a main sequence star, belonging to the spectral class A1V, and it's located in the constellation Canis Major. What sets Sirius apart is its brightness and bluish-white color. It's much smaller than Vy Canis Majoris, with a radius about 1.7 times that of the Sun. Despite its smaller size, Sirius is incredibly luminous and hotter than the Sun, giving it its characteristic blue-white appearance.

Ton 618:

  • Supermassive black hole
  • Mass estimated at 66 billion times that of the Sun
  • No physical size, defined by massive gravitational pull
  • Located in a distant galaxy, far from Earth

Ton 618 is quite different from the other two celestial objects on our list. Rather than being a star, it's a supermassive black hole located at the heart of a distant galaxy. Its mass is estimated to be around 66 billion times that of the Sun, making it one of the most massive black holes known. Ton 618's immense gravitational influence shapes the dynamics of its host galaxy, impacting the movement of stars and other cosmic matter around it.

In short, Vy Canis Majoris is a gigantic red supergiant star, Sirius is a bright bluish-white main sequence star, and Ton 618 is a supermassive black hole with immense gravitational influence.

Sirius vs Ton 618 vs Vy Canis Majoris - Comparison Table

Here's a detailed specification table comparing Vy Canis Majoris, Sirius, and Ton 618:

Characteristic Vy Canis Majoris Sirius Ton 618
Type Red Supergiant Star Main Sequence Star (A1V) Supermassive Black Hole
Size 1,800 times Sun's radius 1.7 times Sun's radius Not applicable (Gravitational)
Color Reddish Bluish-White Not applicable
Temperature Relatively Cool Hot Not applicable
Mass Several times Solar mass 2.02 times Solar mass 66 billion Solar masses
Distance About 3,900 light-years About 8.6 light-years Varies (distant galaxy)


Vy Canis Majoris: A Colossal Red Supergiant

Vy Canis Majoris

Vy Canis Majoris commands attention as one of the largest known stars in the universe. This red supergiant is a true cosmic giant, with a diameter that extends to an astonishing 1,700 times that of our Sun. Nestled in the constellation Canis Major, Vy Canis Majoris showcases the incredible diversity of stars, defying our expectations of size. While its exact distance varies, it's generally estimated to be around 3,800 - 5,000 light-years away. Its sheer size and luminosity make it a captivating object of study for astronomers seeking insights into the life cycle of massive stars.

Sirius: The Brightest Star in the Night Sky


Shift your gaze to the night sky, and you'll likely spot Sirius, the dazzling beacon of the Canis Major constellation. As the brightest star visible from Earth, Sirius has been a guiding light for navigators and storytellers throughout history. Despite its prominent position, Sirius is relatively close in cosmic terms, residing around 8.6 light-years away. Classified as an A-type main sequence star, Sirius dazzles with its white-blue hue. Accompanied by a faint companion known as Sirius B, this binary system adds a touch of intrigue to our cosmic neighborhood.

Ton 618: A Supermassive Black Hole's Dominion

Ton 618

Ton 618 takes us beyond individual stars and into the enigmatic realm of galaxies and supermassive black holes. Nestled within a distant galaxy, this cosmic behemoth is home to one of the most massive black holes known to us. Estimated to be billions of times the mass of our Sun, Ton 618's black hole exerts a gravitational pull that shapes its galactic surroundings. The sheer magnitude of this black hole is a testament to the cosmic forces at play, offering astronomers a chance to study the intriguing interactions between supermassive black holes and their host galaxies.

Size Comparison

Vy Canis Majoris steals the spotlight with its immense size, dwarfing even the largest stars we're familiar with. In contrast, Sirius, while being the brightest star from our vantage point, is relatively smaller in comparison. Ton 618, on the other hand, transcends individual stars, residing at the heart of a galaxy and harboring a supermassive black hole.

Diameter Comparison

Vy Canis Majoris's diameter is truly staggering, stretching over a distance that is thousands of times greater than our Sun's diameter. Sirius, although prominent in our night sky, has a diameter that's much more modest. Ton 618, with its supermassive black hole, boasts a gravitational reach that influences the structure of its host galaxy.

Mass Comparison

Vy Canis Majoris's mass is substantial, befitting its status as a red supergiant. Sirius, while notable for its brightness, has a smaller mass in comparison. Ton 618's mass, dominated by its supermassive black hole, is a cosmic force to be reckoned with, affecting the dynamics of its galactic surroundings.

Temperature Comparison

Vy Canis Majoris's red supergiant nature brings a cooler surface temperature, painting it in warm, reddish hues. Sirius's white-blue hue signifies a higher surface temperature, characteristic of its A-type main sequence classification. Ton 618's supermassive black hole doesn't possess a surface temperature in the same way as stars, as it's an object of immense gravitational influence rather than luminosity.

Distance from Earth Comparison

Vy Canis Majoris lies at a considerable distance from Earth, nestled within the Canis Major constellation. In contrast, Sirius is relatively close, just around 8.6 light-years away, making it one of our nearest neighbors. Ton 618's distance is even more astronomical, residing billions of light-years away within its distant galaxy.

Final Thoughts

Vy Canis Majoris, Sirius, and Ton 618 showcase the astonishing diversity of celestial objects in our universe. From the colossal size of a red supergiant to the brilliance of a nearby star and the gravitational dominance of a supermassive black hole, each entity provides a window into the awe-inspiring mysteries that unfold in the cosmos. As we continue our exploration of the cosmos, these celestial wonders remind us of the boundless beauty and complexity that lie beyond our planet.

Back to blog