Answer:
It is also unknown how big the universe is, some astronomers believe that the universe is infinitely expanding, but astronomers know we can't even see the entire universe we live in, including there may be parts of it with characteristics that is unlike anything we have ever seen and possibly do not follow the laws of physics we obey.
Human beings are also unable to comprehend vary vary large and small quantities, so lets bring it down to something more manageable. The Sun is the largest object we can see in our Solar System and a million of our Earths could fit inside of the Sun. Our Solar System is classified with a certain cluster of solar systems in what is called a galaxy (the one we live in is the Milky Way, and it is a small galaxy and a galaxy can consists with thousands of star systems) and when you refer to a group of galaxies it is referred to as a galactic cluster. All the galactic clusters together will make up the Universe. Everything is encompassed within the Universe, and our planet cannot even be compared to such vast space.
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Original answer:
The Earth cannot be compared to the universe in size. It can't even compare to the sun. Of all of the matter in the entire solar system, the sun is %99.99 including all of the planets, asteroids, and space debris. If this web page represents the sun, the period at the end of this sentence represents the Earth. (Please do not alter your font size.) The universe is at least one times the size of the sun times the dollars America is in debt times 100,000 at this second, if you believe in the big bang theory.