The Saturn moon Titan is one of the most peculiar places in the solar system as it is the only planetoid besides earth to be carrying stable bodies of liquid on its surface - although that liquid is comprised of methane and ethane.
The vapor jets were not detected during Hubble's observations in the same region in October 1999 or even November 2012, n The Galileo probe, which flew by Europa nine times in the late 1990s, didn't see any plumes there either.
