Finding water on Mars has been like “Finding Neverland.”

Scientists in the past have launched various Mars missions to know if microbial “alien” life existed or exists on Planet Mars.

In 2006, Mars Global Surveyor spacecraft, which began orbiting Mars in 1997, provided images of two gullies on Mars that suggest water carried sediment through them.

In 2008, laboratory tests aboard NASA's Phoenix Mars Lander identified water in a soil sample.

In July 2011, scientists claimed to have found traces of water under a thin varnish of iron oxide.

More recently, NASA scientists on Thursday revealed that they have found flowing salt water on the red planet.

The water appears in spring and summer on a slope inside Mars' Newton crater, as observed by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter on May 30, 2011.

“Salt deposits over much of Mars indicate brines were abundant in Mars' past. These recent observations suggest brines still may form near the surface today in limited times and places,” NASA said in a statement.

Start the slideshow to view images from NASA’s past Mars expeditions suggesting evidence of water on the Martian surface.