How small is a human compared to the universe?

Hint: The average human size is around 1.76 m while the sun alone is 333 thousand times larger than the Earth. While the solar system has billions of solar systems like ours and the universe has billions of galaxies like the milky way, this gives us a rough picture of how far and wide the universe spreads and it is still expanding.

Complete solution:
A system of different planets and a star make up the solar system. Different solar systems together make up a galaxy and collection of galaxies make up the universe.

The galaxy in which our solar system exists is known as the Milky Way. In our galaxy alone there are about 100-500 billion solar systems. In the whole universe about two million million galaxies are observable then the number of unobservable galaxies or the total number of galaxies is exceptional. This gives us an idea of how large our universe is and it is still expanding every second.

The size of an average human is 176.5 cm or 1.76 m while the diameter of the solar system alone is $287.46\times {{10}^{11}}m$.
$\dfrac{287.46\times {{10}^{11}}m}{1.76}=163.33\times {{10}^{11}}$

Therefore, the solar system is about $163.33\times {{10}^{11}}$ times greater than a human then the universe must be infinite times greater than a human.

Note:
The universe does not only have galaxies but other heavenly bodies like stars, black holes, dwarf stars, remnants of stars, dust particles etc. The size of the universe is measured by detecting waves coming from the early universe; these waves are known as baryonic acoustic oscillations. Sometimes scientists also use supernovas to calculate the size of the universe