Europa is an ice-encrusted moon of Jupiter with a global ocean flowing underneath its surface. NASA is planning a mission soon that will look for signs of possible life there.

Now, a new finding from old data makes that mission even more tantalizing.

In recent years, the Hubble Space Telescope has spotted what looks like plumes, likely of water vapor, reaching more than 100 miles above the surface.

The plumes, if they exist, could contain molecules that hint at whether Europa possesses the building blocks of life.