12.And even tinier compared to VY Canis Majoris, the largest known star in the milky way galaxy.
13.The diameter of the observable universe is estimated to be 93 billion light years. But the size of the entire universe is thought to be so gigantic that scientists are unable to put a number on it.
14.There's no evidence to suggest that the universe has an edge. Even if it does, we'll probably never reach it.
15.But there are still so many unanswered questions about life and humanity on Earth. For example, researchers still don't know exactly why humans dream.
16.No one knows exactly why humans produce tears of laughter, joy, and sorrow. There are many different types of tears, but emotional tearing is thought to be unique to humans.
17.And even though time is such a significant part of life, no one can explain when it began or whether it will end. Some believe time is an illusion constructed by humans, and others believe that time existed long before humans recorded it.
18.Our planet has been around for a very long time. Scientists have estimated the age of the earth to be 4.55 billion years old.
19.And the global human life expectancy of 70 years represents only 0.00001556% of that, so let’s make the most of the short time we have!
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