One day when I was randomly sitting on the terrace, one thing has suddenly caught my mind, i.e., EXISTENCE ?  Some of the plenty unanswered questions in my mind, are WHAT IS LIFE? HOW IT HAS STARTED? HOW IT'S GONNA END? Generally, we all might have read about Big Bang theory. It states that all the matter which is present now is made around 13 billion years ago, and states whole Universe started with a tiny ball. But, how was it actually formed? What was there before it? My interests towards findings answers to these questions has landed up me to an interesting topic ASTRONOMY. As a kid, I always wanted to be an Astronaut (sounds funny but yeah, like many of the innocent kids). So, this particular subject has been attracting me from long. So, recently I started googling and I am still a novice in it. Let me share some of the many interesting things which I have learnt (which you might have already known, I said right, I am a novice in it yet). 1. Do you know that size of Mercury is...