The Universe is an evolving environment. Many celestial bodies, unfortunately, change too slowly over a lifetime, but some phenomena can radically change our lives in few seconds. Bright meteors, commonly called falling stars, can suddenly turn on the sky, leaving us speechless. Some small icy and remote celestial bodies can be thrown into the inner parts of the Solar System and transform into marvelous comets. Last, but not least, there is the most impressive show of Nature: a total eclipse of Sun, the most beautiful and exciting experience of our life.