A question of how big something can be.
When speaking about the biggest object in the universe, you must always remember galaxy IC-1101.
Why don’t we see how big it actually is?
Milky Way:
Our galaxy, the Milky Way, is 100,000 light-years across, with an estimated 400 billion stars in it. 100,000 light-years would be 1,000,000,000,000,000,000 kilometers across. Now, let’s see how long it would take you, to cross it, with humanity’s fastest spacecraft. Let’s start with the math. As stated earlier, the Milky Way galaxy is 100,000 light-years across, each light-year is approximately 6 trillion miles, and for us to cross just one light-year, it would take us nearly 20,000 years with humanity’s fastest spacecraft New Horizons. Unrealistically, It would take you a wopping 2 billion years to cross our own galaxy with the fastest thing we have.
Andromeda:
The Andromeda galaxy has more than twice the amount of stars than our galaxy has (one trillion to be exact), and is 2.5 million light-years away from Earth. Now, this galaxy is about 140,000 light-years across, compared to 100,000 light-years the Milky Way. Doing the same math, it would take you 2.8 billion years to cross it with the exact same spacecraft, without adding the time it would take you to get there.
Now here ‘s where things get big:
IC 1101:
This galaxy is approximately 1.2 billion light-years away from Earth. It has 100 trillion stars, making literally a dot of the Milky Way, and the Andromeda Galaxy. This galaxy is 50 times the size of the Milky Way, and 2,000 times as massive. Doing the math, it would take us a mind-boggling 100 billion years to cross that galaxy. I must confess I was getting pretty excited while making this answer.
We are as tiny as we can get.