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How big is the Sagittarius Dwarf Galaxy?

The Sagittarius Dwarf Galaxy is 94 exameters

The Size of the Sagittarius Dwarf Galaxy: A Tiny Marvel in Our Milky Way

Have you ever looked up at the night sky and wondered about the galaxies and stars that twinkle back at you? One of these glittering celestial bodies is the Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), a tiny galaxy right in our Milky Way’s backyard. But don’t let the word ‘tiny’ fool you, because when it comes to the universe, even the smallest things can be incredibly vast.

How Big Is the Sagittarius Dwarf Galaxy?

The Sagittarius Dwarf Galaxy, discovered in 1994, is about 10,000 light-years in diameter. That’s massive, right? Well, in the grand scheme of things, it’s actually quite small compared to other galaxies! For example, our home galaxy, the Milky Way, spans a whopping 100,000 light-years in diameter. That’s ten times the size of the Sagittarius Dwarf Galaxy!

  • The Sagittarius Dwarf Galaxy: 10,000 light-years - The Milky Way: 100,000 light-years And if we take a step further and compare the Sagittarius Dwarf Galaxy to the largest known galaxy, IC 1101, the size difference is awe-inspiring. IC 1101 spans about 6 million light-years, dwarfing our little galaxy.
  • The Sagittarius Dwarf Galaxy: 10,000 light-years - IC 1101: 6 million light-years These comparisons give us a better perspective on the vastness of the universe and how the Sagittarius Dwarf Galaxy fits into this cosmic jigsaw puzzle.

Sagittarius Dwarf Galaxy’s Orbital Adventure

The Sagittarius Dwarf Galaxy is currently about 70,000 light-years from Earth, orbiting our Milky Way Galaxy. This orbit takes the galaxy over the Milky Way’s galactic poles, about 50,000 light-years from the Milky Way’s core. That’s roughly one third of the distance of the Large Magellanic Cloud, another galaxy near us. In its looping, spiraling path, this little galaxy has passed through the plane of the Milky Way several times in the past. These galactic encounters have caused ripples and perturbations in a set of stars near the Milky Way’s core. These movements were triggered when the Sagittarius Dwarf Galaxy moved past the Milky Way between 300 and 900 million years ago.

A Galaxy Full of Surprises

Despite its small size, the Sagittarius Dwarf Galaxy is packed with intriguing features. It contains four globular clusters in its main body, with the brightest of them—NGC 6715 (M54)—being known well before the discovery of the galaxy itself. The study of these clusters and their movements has provided astronomers with valuable insights into the history and makeup of our own Milky Way, demonstrating that size doesn’t always equate to significance. In conclusion, the Sagittarius Dwarf Galaxy may be petite when compared to the colossal galaxies that populate our universe, but it’s an integral part of our galactic neighborhood. Its size, orbit, and the fascinating features it houses make it a compelling subject of study, reminding us that the universe is always full of surprises, no matter how big or small!

Smaller By Category
Small Magellanic Cloud
The Small Magellanic Cloud is only called small because it is smaller than the galaxy nearest to it, the Large Magellanic Cloud. If the Large Magellanic Cloud were smaller, the Small Magellanic Cloud would be called the Large Magellanic Cloud!
Canes Venatici Dwarf Galaxy I
The Canes Venatici Dwarf Galaxy I is 685,000 light-years away from us. If you zoom out to that scale, this galaxy will be a couple pixels across.
Leo II Dwarf Galaxy
The Leo II Dwarf Galaxy is a satellite of the Milky Way Galaxy. It is one of the largest of around a hundred known satellites of the Milky Way. Like most dwarf galaxies, the stars in Leo II are metal-poor. They're also relatively old.
Larger By Category
Large Magellanic Cloud
The Large Magellanic Cloud is only called large because it is larger than the galaxy nearest to it, the Small Magellanic Cloud. If the Small Magellanic Cloud were larger, the Large Magellanic Cloud would be called the Smaller Magellanic Cloud! We think the two galaxies used to be one, and were split apart by the Milky Way.
NGC 3310
NGC 3310 is another one of those galaxies that have collided with other galaxies, altering their shape. It is a spiral galaxy that has very beautiful arms and is around 35 million light-years away.
Sombrero Galaxy
Do you think the Sombrero Galaxy looks like a sombrero? I'm not sure. Oh! Did you know that there is a supermassive black hole in the center of this galaxy? Most large galaxies have supermassive black holes, even our Milky Way!