What Are the Largest Things in the Universe?

What's the largest thing... in the universe? The question is answered by basic philosophy - the universe itself. We do not know how large the universe is, it may be infinite for all we know. What we do know is that the observable universe, the portion of space that light has had time to reach us in, is approximately 92 billion light years in diameter. The observable universe itself is the largest thing in the universe, by our perspective and current knowledge.

The largest known structure, is called the Sloan Great Wall. It is made up of a high concentration of galaxies, called a galactic filament. The Earth is not in this structure, we lie about a billion light years away. Galactic filaments make up some of the largest structures known in the universe.
The Sloan Great Wall as seen by the SDSS in 2007. The red box
encompasses the structure. [1]
The largest known galaxy, is called IC 1101. It contains more than 100 trillion stars, and lays in the constellation Serpens. IC 1101 is categorized as a supergiant lenticular elliptical galaxy. Because of the old age of this galaxy, there are also many old metal producing stars. This is what gives the galaxy it's yellow hue.
The largest known galaxy IC 1101. At the heart of this
galaxy is a supermassive blackhole. [2]

The largest known nebula, is called the Tarantula Nebula. It can be found in the Large Magellanic Cloud, and is the brightest known non-stellar object. If the Tarantula Nebula was as close to Earth as the Orion Nebula (some 1,344 light years) shadows would be cast on Earth from it. 

The Tarantula Nebula as seen by the TRAPPIST national
observatory at La Silla peak. [3]

The largest known star, is called VY Canis Majoris. This star is so large, that if it replaced the Sun in our solar system, it would extend beyond the orbit of Saturn! This star is a red hypergiant located in the constellation Canis Major (the big dog). It has a diameter of 13.4 AU (1 AU = the distance between the Sun and Earth). 

An artist's depiction of VY Canis Majoris in comparison
to our Sun. 

The universe is an enormous place, full of improbabilities and chance. Modern astronomy and cosmology has only recently begun to find anomalies and interesting stories hidden in the fabric of space and time.

Have a burning question? Ask below!

Image Credit - [1]-Nasa, [2]-David A. Aguilar, [3]-TRAPPIST