The Universe
宇宙
宇宙一般定義為整體存在的一切，包括所有的物理物質和能量，行星，恆星...但這種用法可能不同的上下文.
宇宙論被提出來解釋觀測宇宙。最早的定量模型，開發了地心的古希臘人，宇宙具有無限的空間，永遠存在的，但包含一個單一的一套有限的同心球大小 - 對應的恆星，太陽和行星不同 - 旋轉約一球，但動不動地球。幾個世紀以來，更精確的意見和改進理論重力導致Copernicus'sheliocentric模型和牛頓的太陽系模型。進一步改善天文學導致認識到，太陽能系統是嵌入在一個星系組成的數以百萬計的恆星，銀河系和其他星系存在的外面，就可以達到天文儀器。
這種高清晰度圖像的哈勃超深場顯示出各種各樣的星系，每十億恆星組成的。在同等面積的天空圖片中顯示佔據左下角。由於普朗克的時代，宇宙一直在擴大其目前的形式，可能與一個短時期（小於 10-32秒）宇宙通貨膨脹。幾個獨立的實驗測量支持這一理論的擴展，更普遍，宇宙大爆炸理論。最近的觀察表明，這種擴張正在加速，因為暗能量，而且大部分的物質在宇宙中可能的形式，不能檢測到目前的儀器，因此不計算在本模型的宇宙，這已被任命為暗物質。目前觀測的不精確的預測也阻礙了對宇宙的最終命運。
Generally defined as the total universe of all existence, including all physical matter and energy, planets, stars, galaxies... But this usage may be different context (as defined below).
Cosmology and cosmology is proposed to explain the observed universe. The first quantitative model of the ancient Greeks developed the center of the earth, who proposed that the universe has infinite space, will always exist, but contains a single set of concentric spherical finite size - corresponding to the stars, sun and planets different - rotate about the ball, but motionless Earth. Centuries, more precise observations and improved theories of gravity and Newton led Copernicus'sheliocentric model solar system models, respectively. Further improve the understanding of astronomy led to the solar system is embedded in a galaxy composed of millions of stars, the Milky Way and other galaxies exist outside, you can reach astronomical instruments. Examine the distribution of these galaxies and their spectral lines, leading to many modern cosmology.
The high-resolution images of the Hubble Ultra Deep Field shows a variety of galaxies, each consisting of billions of stars. Under the same sky area shown in the picture occupies the lower left corner.. As the Planck era, the universe has been expanding its current form, may be a short period (less than 10-32 seconds) cosmic inflation. Several independent experimental measurements support the extension of this theory, more generally, the Big Bang theory. Recent observations show that the expansion is accelerating, because dark energy, and most of the material may form in the universe can not be detected by current instruments, so not included in the model of the universe, dark matter that has been named. Present observations of inaccurate forecasts have also hindered the ultimate fate of the universe.
The only a small part of the universe, due to restrictions imposed by the speed of light. Since we can not go beyond the restrictions of space, observation of light (or any electromagnetic radiation), it is uncertain whether the size of the universe is finite or infinite.