UY Scuti, the largest star in the universe, has a radius that is 1,700 times larger than our sun's. Such a star is also able to undergo Nuclear Fusion of much denser and heavier objects. In other words, it is able to produce a LOT more energy than our sun.In addition to that, UY Scuti is also 340,000 times more luminous than our sun. It is still incredibly easy to see despite being many thousands of light years away.Fun fact, UY Scuti also has a circumference of 4.7 billion miles. To put that in perspective, the sun's circumference is 2.7 million miles.&nbsp;That is one very big star.

What is the Biggest Star in the Universe?

Space

UY Scuti

While a perfectly flat universe would extend out to <a href="https://www.livescience.com/counting-beyond-infinity.html" rel="noopener noreferrer" target="_blank">infinity </a>, a flat universe with a multiply-connected topology would have finite size. If we could somehow determine whether one or more dimensions are wrapped in on themselves, then we would know that the universe is finite in that dimension. We could then use those observations to measure the total volume of the universe.But how would a multiply-connected universe reveal itself?

Look to the light

The team found that a multiply-connected universe about three to four times larger than our observable bubble best matched the CMB data. While this result technically means that you could travel in one direction and end up back where you started, you wouldn't be able to actually accomplish that in reality. We live <a data-component-tracked="1" dir="ltr" href="https://www.livescience.com/what-is-dark-energy.html">in an expanding universe </a>, and at large scales the universe is expanding at a rate that is faster than the speed of light, so you could never catch up and complete the loop.

Imagine a universe where you could point a spaceship in one direction and eventually return to where you started. If our universe were a finite donut, then such movements would be possible and physicists could potentially measure its size.

Astrophysicists say our universe might be shaped like a three-dimensional donut, meaning you could point a spaceship in one direction and eventually return to where you started.

Space stuff

Our universe might be a giant three-dimensional donut, really.

Supernova are stellar explosions that take place when a star reaches its final stages of life. Research shows that they occur once every 3 centuries however the remnants of these explosions take a long time to reach us.&nbsp;Supernova can also take place if a star develops and iron core that is larger than the Chandrasekar mass (the largest mass that a star can reach before imploding).&nbsp;When these events do take place, they can be up to five billion times brighter than the sun!All in all, supernova are very dangerous, but very interesting scientific phenomena.

What are Supernova?

Supernova

Neutron Stars are the most dense category of stars that form when a star collapses in on itself. These stars have 1.4 solar masses (1.4 times larger than our sun) and have a radius of 6.2 miles. The reason they have the name "Neutron Stars" is also because it is believed that they are comprised of mostly neutrons.Neutron Stars also lose the ability to generate heat because of how tightly packed the particles are against each other. Despite this surface cooling, it may still be very hot due through further collisions with other stars or an accretion (a gravitationally bound disk of particles).

What is a Neutron Star?

Neutron Star

Cygnus X-1 takes the throne for largest Black Hole in our universe. This black hole also happens to be 6000 light-years away. Another interesting thing to note is that the concept for black holes themselves is relatively new meaning that there is still a large amount of assumptions and incomplete solutions attached with them. Especially when the singularities are in question, there is almost no distinction between "right" and "wrong".