NASA to hold media call on evidence of surprising activity on Europa This Monday NASA is having a press conference to announce interesting activity detected that may be related to the presence of a subsurface ocean on Europa. Scientists think that Europa's ocean has an Earthlike chemical balance. The new information to be presented Monday is based on observations with the Hubble Space Telescope. Although the Juno Space Craft currently in Jupiter orbit it will not be spending too much time studying Europa, but there are many interesting Europa missions such as the Europa fly by mission.