It’s not aliens. And it’s not exactly surprising, despite NASA’s advance billing. But new evidence of water plumes emanating from Europa, an ice-covered moon of Jupiter, have added to the excitement over a proposed mission that could sample the water for signs of life.
The evidence comes in the form of splotchy ultraviolet images captured by the Hubble Space Telescope, operating at the limits of its sensitivity. Scientists say the images appear to show intermittent emissions of water vapor near Europa’s south pole.
“If plumes exist, this is an exciting finding,” William Sparks, an astronomer at the Space Telescope Science Institute in Baltimore, told reporters today during a teleconference.