Since NASA's Viking Task tested Martian soil back in the 1970s, we've known that Mars（火星）is covered with a desert—harmful to life as we know it But since tasks to Mars paid attention to what lies under the desert, a different picture has started to appear.
This discovery of water under the Mars' South Pole is the result of radar echoes（雷达回波）that were picked up by an instrument on a spaceship that's been moving around Mars for 15 years. To stay liquid（液体）under the long-frozen desert of Mars, the researchers say this lake must have a lot of salts mixed in it.
It is very cold and saltiness would make it a very hard environment for any living thing. But the lead researcher, Professor Roberto Orosei from the Italian National Institute for Astrophysics, said it was not impossible for things to live there.
To search for life in this newly discovered lake, scientists will need to send a robot that's able to make a hole through the mile of ice covering it. But at least the teams looking for life on Mars will now know where to start their search.
