Researchers have found evidence of an existing body of liquid water on Mars.
What they believe to be a lake sits under the planet's south polar ice cap, and is about 20km (12 miles) across.
Previous research found possible signs of intermittent liquid water flowing on the Martian surface, but this is the first sign of a persistent body of water on the planet in the present day.
Lake beds like those explored by Nasa's Curiosity rover show water was present on the surface of Mars in the past.
Portugal star football Cristiano Ronaldo is coming under fire after he threw a television reporter's microphone in a lake.
The reporter believes negative press might have been the reason for his reaction.
Diogo Torres of CMTV tried to conduct a live interview with the Portugal forward early on Wednesday when the incident happened.
Portugal is preparing for their final Group F game against Hungary later in the day.