NASA will soon reveal its new results about the ocean worlds.
Agency’s Cassini spacecraft and the Hubble Space Telescope have cultivated these new findings.
'These new discoveries will help inform future ocean world exploration - including NASA’s upcoming Europa Clipper mission planned for launch in the 2020s - and the broader search for life beyond Earth', NASA said.
The US space agency has called a press conference at 2pm on Thursday, but refused to give out any more details.
The event will held at the James Webb Auditorium at NASA Headquarters in Washington with remote participation from experts across the country.
According to rumuors this announcement could be a revelation about Jupiter's sixth-closest moon Europa, ahead of the 2020 Europa Clipper mission, or Enceladus, the sixth-largest moon of Saturn.
The moon, which lies 500 million miles from the sun, has an ocean lying beneath its surface which makes it one of the most likely places in the solar system for life to thrive. Because Europa has the potential to have more liquid water than we have on Earth, some have speculated that the surprise may hold evidence for life.
The 1,900-mile-wide (3,100 km) moon carries a huge ocean of liquid water beneath its icy shell.
Astronomers think this ocean is in contact with Europa's rocky mantle, making all sorts of interesting chemical reactions a possibility.
Experts see this discovery as a step towards finding life beyond Earth.