At only 310 miles in diameter, one of Saturn's tiny moons might be hiding a big secret.

Enceladus may be just 14 percent the size of Earth's moon, but NASA in the coming years, according to Space.com. They're hoping to launch a mission to the moon by the end of 2021, just after they begin a different mission to one of Jupiter's moons, Europa, in 2020, the report added.

An artist's rendering of Saturn's moon Enceladus that depicts possible hydrothermal activity.

(NASA)

"Many astrobiologists regard Europa and Enceladus, which are both thought to harbor oceans of liquid water beneath their icy shells, as the solar system's two best bets to host alien life," the report added.

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In 2005, the Cassini spacecraft discovered Enceladus , and NASA scientists have been eyeing a possible mission to the moon ever since.

The idea for the mission has been named the Enceladus Life Finder, or ELF, and has been submitted as a possible mission in NASA's Discovery program, Space.com added. They will review all mission ideas that are submitted to narrow down the contenders to a few finalists, then a winner will be chosen around this time next year.

"We think we have the highest chance of success of getting an indicator of [alien] life for really any mission at this point," ELF concept principal investigator Jonathan Lucine told Space.com.

But other NASA scientists to spend millions of dollars looking for life on Enceladus. According to a separate Space.com report, Brent Sherwood of NASA's Jet Propulsion Laboratory expressed reservations about an Enceladus mission when he spoke at the Astrobiology Science Conference in June.

"These are very hard decisions for decision makers to make when there are a lot of zeros after the dollar signs," he said.

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A state police cruiser parks along Winthrop Shore Drive just after high tide as side streets were flooded during a storm that left as much as a foot of snow in some areas, March 8, 2013. (Darren McCollester/Getty Images)