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Nothing is standing or stationary. As you are reading this, the Earth spins around its own axis; it revolves around the sun, the sun is moving through space at a stunning 792,000 km/h around the gigantic center, and our universe is moving at a mind-boggling 2.1 million kilometers per hour. You may contemplate that as you are reading this, your body in a stationary position. But, everything inside the universe travels, from our planet (Earth) –which revolves on its axis at a speed of approximately 1700 km/h— to the solar system and even the Milky Way Galaxy. All the planets in the solar system and their personal moons also travel through space. Actually, in order to retain a stable orbit, it is essential for Earth to move around 30 km/s. The innermost planets in our system, Mercury and Venus travel faster while planet Mars and the external planets of our solar system fly through space at a sluggish pace. But think superior and bigger. Even yet the Sun is at the heart of our solar system, it is also travelling at an unbelievable speed through space. If we consider even bigger, we will understand that even our gigantic Milky Way galaxy is in motion, and all continuing things that make up the universe such as stars, gas clouds, planets, black holes and even the mighty dark matter travel within the universe. Just as Earth revolve around the Sun and our Sun revolves the galactic center –which from our vantage point is situated around 2500 light-years away— in an elliptic trajectory. It finishes a revolution every 225 million years roughly. This is known as a Galactic year. It is predicted that since the Sun and Earth came into being, 20 galactic years have passed, which means that we ended 20 successful revolutions orbiting the galactic center. However, if we relate detailed human history to our movement through the universe, we would understand we hardly moved in our galactic path.
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