Listen to Nasa's mystery announcement about 'surprising activity' on Europa (FYI: it's not aliens)

Nasa is set to make an announcement about "surprising activity" on Jupiter's icy moon, Europa. The space agency announced a press conference regarding findings from Hubble images last week.

"Astronomers will present results from a unique Europa observing campaign that resulted in surprising evidence of activity that may be related to the presence of a subsurface ocean on Europa," a statement from Nasa said.

The teleconference will be broadcast live online. You can listen in by clicking here. It will begin a 2pm EDT (7pm BST).

Participating in the conference will be Paul Hertz, director of the Astrophysics Division at Nasa; William Sparks, an astronomer with Baltimore's Space Telescope Science Institute; Jennifer Wiseman, senior Hubble project scientist at Nasa's Goddard Space Flight Centre; and Britney Schmidt, from the School of Earth and Atmospheric Sciences at Georgia Institute of Technology in Atlanta.

There has been widespread speculation regarding the "surprising activity", with the most far-flung relating to the potential for alien life. Scientists have long speculated Europa has a liquid ocean beneath its icy shell, which some believe could host microbial lifeforms. However, Nasa has already ruled his out with a tweet saying: "Spoiler alert: NOT aliens."