Universe



Universe

I have read something interesting today. What did you know about universe? What is in it?. The universe is commonly defined as everything that exists. Including all kind of physical matter and energy, the planets, star, galaxies, and all the content of space. Astronomers can use telescopes to look at very distant galaxies like they see what the universe look like long time ago. They happen because of the light of the universe take very long time to reach us. From this observation it seems the physical laws and constants of the universe have not changed. Physicists are currently unsure if anything existed before the big bang. They also unsure whether the size of the universe is infinite. The word universe comes from the old French univers which come from latin word universum. A different interpretation of univorsum is “everything rotated as one “or “everything rotated by one”. Usually the universe is thought to be everything that exist, has existed, and will exist. This definition says that universe is made of two elements: space and time, together known as space-time or vacuum and matter and different forms of energy and momentum occupying space-time. The two kinds of elements behave according to physical laws. The universe is huge and possibly infinite in volume. The matter which can be seen is spread over a space at least 93 billion light years across. For comparison the diameter of a typical galaxy is only 30.000 light years, and typical distance between 2 neighboring galaxies is only 3 million light years. As an example our Milky Way galaxy is roughly 100.000 light years and our nearest galaxy is Andromeda located roughly 2.5 million light years away. Wow it is the first word came out of my mouth when I read those article about the universe. The universe is nearly unlimited, it is so wide, so far, and we need millions upon millions of years to travel the universe. Can you imagine it? It will be awesome if we could go there, many beautiful stars and planet in various sizes. It also can be quite dangerous because of black hole, comet, asteroid, and many more.

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