Direct evidence was not obtained until 1995 when data from the Hubble Space Telescope and other observations had already suggested the existence of liquid methane on Titan , either in disconnected pockets or on the scale of satellite-wide oceans , similar to water on Earth .
It was possible that there were seas of liquid methane on Titan and first suggested after reading Voyager 1 and Voyager 2 information that showed Titan to have a thick atmosphere , capable of supporting lakes , but exact evidence was not found until 1995 when pictures from the Hubble telescope and other telescopes had already shown some proof of liquid methane , possibly in lakes or planet-wide oceans , similar to oceans on Earth .