Humans have always sought ‘heaven’ – a celestial world of imagination, that exists beyond the boundaries of their knowledge, and is much more beautiful than this world. However, how much do we know about the world we inhabit and the physical universe beyond the Earth’s atmosphere?The universe encompasses billions of galaxies. Our solar system is located in one of those galaxies called the Milky Way. The Earth is just one of the planets that exist in our solar system. The universe has many secrets and mysteries, and the humans have only discovered a small fraction of those. Let us take a look at some of them.