Water Looking out a window during my trip to Moscow by train, I am observing original old buildings covered with snow, which is almost everywhere here in this season, making our life more fabulous. Snow or ice is one of states of water, which is certainly the most important source of life in a known part of the Universe. However, haven't you ever wondered where our water is from? It is a quite interesting question, isn't it? By today, as I remember, scientists have formulated several theories on origins of Earth's water, and here I am going to tell about a couple of them. So, if I asked you where water is in the Space, perhaps, you would remember comets' tails - and it represents the first theory. Indeed, according to different sources, in early periods of Earth existence many comets were falling down on the surface and bringing some amount of water onto our planet. However, was this amount significant enough to form all our oceans? Many scientists argued that the amount was not enough, and so was formed another theory, based on migration of the biggest planet in the Solar System - Jupiter. According to this theory, a certain part of dispersive ice from our big neighbor was captured by Earth's gravity during Jupiter movement near our planet. That ice ultimately became our water, launched the Earth's cycle and created conditions for life. In addition, one more thing that I am going to say. Isn't it interesting that we are living in conditions, which are only seemingly constant: brightness of our beautiful star, locations of planets and duration of year? Actually, our present is just a flash in comparison with life of this constantly changing Universe.