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Scientists think that there has been life on the earth for millions of years. However, we haven't found life on other planets yet. The earth is a planet and it goes around the sun. And there are seven other planet that also go around the sun.
科學家認為生命已經在地球上存在了數百萬年。但是，人類還沒有在其他星球上發現生命。地球是行星，圍繞太陽運行。還有另外七個行星也繞著太陽運行。
The sun and its planets are called the solar system. The solar system is a small part of the universe.
太陽以及圍繞它運行的行星被稱為太陽系。太陽系只是宇宙的一小部分。
Scientists have launched many spaceships to explore other planets in the solar system. Some spaceships have gone beyond the solar system. However, no one has discovered any life in space yet.
科學家們發射了很多宇宙飛船，去探索太陽系中的其他星球。有些宇宙飛船已經飛出了太陽系。但是，還沒有人在太空中發現任何生命。
Why has no one from other planets sent us a message? Have they tried to send information to us? With so many stars in space, are we alone, or is there life on other planets in space?
為什么其他星球上沒有任何人給我們發信息呢？他們有試過給我們發信息嗎？太空中有這么多行星，我們是唯一的生命嗎？還是其他星球上也有生命？
