Scientists searching for signs of life beyond earth are keen to learn about the presence of water on other planets - - both in and beyond our solar system - - because water is thought to be fundamental to the existence of life 科学家们一直在寻找外太空的生命迹象，非常想弄清别的行星上是否有水存在，不管是在太阳系或其他星系，水被认为是生命存在的基础。
