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It is your perception and senses that determine what kind of world you see, rather than the world dictating what you are able to perceive.

There is a saying: “Seeing is believing.” Every one of us trusts our own senses. Especially with advances in technology, humanity seems to feel almighty. We have landed on the Moon; nowadays, space probes go far beyond the Moon, heading for Mars, Saturn and other celestial bodies. We can also dive deep into the ocean. As a result, we feel that human beings possess tremendous power.

Yet science also reveals just how tiny we humans truly are. In astronomy, scientists can estimate the scope of the observable universe. For instance, we live in the Solar System. Where is the Solar System? It lies within the Milky Way galaxy. How many solar‑like systems are there in the Milky Way? Roughly 200 billion. And how many galaxies like the Milky Way exist across the universe? Approximately 200 billion.